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NewJeffCT Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 04:44 PM
Original message
Enlighten me on global warming
Before I go respond to our office's most vocal republican...

I'm no expert, or even semi-knowledgeable, about global warming...so, if somebody could enlighten me a bit on global warming, I would appreciate it:

-Isn't global warming pretty much accepted as a scientific fact everywhere outside the US?

-any studies indicating otherwise have had some sort of connection to large, energy related industries?

Thanks
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Melodybe Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 04:46 PM
Response to Original message
1. Google my grandpa Dr. Wallace S. Broecker he is as informed as it gets on
global warming. And on a personal note, he is a staunch liberal Democrat and cool to boot.
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seasat Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 05:57 PM
Response to Reply #1
9. Your Grandfather is Wally Broecker?
Cool. I read a ton of his papers when I was starting out in oceanography in the early 90's. Tell him I learned a lot from his research and he was great influence.

From another stauch Democratic Oceanographer

BTW, to the first poster. The green house gas theory of the atmosphere has been around since 1876! Without the natural level of green house gases, the earth would have an average temperature of -18°c. It is a very well supported theory and no scientist doubts it (well you can probably find a nut bag or two that think the earth is insulated by pixie dust). Also no scientist doubts that CO2 and other green house gases absorb and reradiate infrared radiation. Human activity is very clearly the major source of green house gases in the atmosphere. Volcanoes only put out a miniscule amount of CO2 compared to humans (0.1% of human output). If the warming was due to solar radiation, then why is the stratosphere cooling while the lower troposphere warming? If the sun's output had increased significantly, you would expect some warming as gases in the stratosphere absorbed the downwelling irradiance. The green house gas theory of global warming has both correlation and causality while the alternative hypotheses put forth by a small minority of scientists do not.
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Dogmudgeon Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 07:06 PM
Response to Reply #9
12. More on "Wally" Broecker
He has his lay fans, too. I was never in oceanography, meteorology, or climatology, but these topics have always been interests of mine. I took notice of climate change theories in the late 70s - early 80s when I was in college. I think it was when Broecker first proposed the idea that the climate could "flip-flop" (to use William Calvin's phrase) in just a few years. I know that by the early 1990s, it was impossible to avoid his work on climate change.

There's a movie coming out this summer, The Day After Tomorrow, based on Art Bell and Whitley Strieber's The Coming Global Superstorm. Not exactly Science Moft Rigourous, but an entertaining read, and the movie looks pretty cool, too. While Bell and Strieber have bad reputations around the science community, their book does cite a lot of scientific work. Between the book and the movie, the problems of climate change should become much better known.

For those with a modicum of scientific literacy, this link to a paper by Dr. Broecker gives a good introduction:

Will Our Ride into the Greenhouse Future be a Smooth One?
ABSTRACT

The climate record kept in ice and in sediment reveals that since the invention of agriculture some 8000 yr ago,climate has remained remarkably stable. By contrast, during the preceding 100,000 yr, climate underwent frequent, very large, and often extremely abrupt shifts. Furthermore, these shifts occurred in lockstep across the globe. They seem to be telling us that Earth's climate system has several distinct and quite different modes of operation and that it can jump from one of these modes to another in a matter of a decade or two. So far, we know of only one element of the climate system which has multiple modes of operation: the oceans' thermohaline circulation. Numerous model simulations reveal that this circulation is quite sensitive to the freshwater budget in the high-latitude regions where deep waters form. Perhaps the mode shifts revealed in the climate record were initiated in the sea. This discovery complicates predictions of the consequences of the ongoing buildup of greenhouse gases in the atmosphere. If the major climate changes of glacial time came as the result of mode shifts, can we be certain that the warming will proceed smoothly? Or is it possible that about 100 years from now, when our descendants struggle to feed the 15 or so billion Earth inhabitants, climate will jump to a less hospitable state. It is difficult to comprehend the misery that would follow on the heels of such an event!
There has been a lot of research done in this field over the past deacde. It is not difficult to find at all.

--bkl
Ice, ice, baby!
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pmbryant Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 04:50 PM
Response to Original message
2. It is accepted as scientific fact within the US too
Edited on Thu Jan-15-04 04:51 PM by pmbryant
The only real scientific disputes now are how big the warming will be (i.e., big or really big), and what its effects will be (about which no one has any real clue).

As I've said in an earlier thread about global warming today, the Union of Concerned Scientists (link) has one of the most readable summaries of this issue that I have seen on the internet.

--Peter
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RobertSeattle Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 04:52 PM
Response to Original message
3. The Right Wing every changing stance on Global Warming
First it was:
"Global Warming Doesn't Exist"

Then it was:
"Global Warming exists, but it doesn't matter"

Then it was:
"Global Warming exists, does matter, but isn't cause my man"

Someday it will be:
"Global Warming... Hey what happen to my mansion on the beach in Florida?!!"
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Homer12 Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 05:03 PM
Response to Original message
4. First lay the groundwork
1) Global warming has been happening since the end of the last Ice age say 15,000-12,000 years ago was the Last Glacial Maximum.

It is a "fact" that since then the global Climate has warmed numerous degrees.

Global Climate change: Warming and Cooling is a fact that can not be disputed.

Your vocal republican will laugh I'm sure at this, but stating the obvious will help you.

2) The real question and argument comes down to this, " Is the Global Warming we see today Human induced?"

Point - Local climate is different from global climate in the way they react to climate change (i.e. snwoing in new york today does not prove the human induced global warming as a theory is wrong)

The Best Point -

The Human population on Earth is 6 billion and rising and in teh next 100 years will be up to 10 Billion; with exponetial growth.

On a local level human beings change their environment (i.e pollution, deforistation, etc...)

If human beings can transform their surrounding environments at a local level, what would 6 billion people and counting do to the earth on a Global Level (i.e. deforestation and the destruction of carbon sinks like rainforests, plankton in the ocean by poillution, etc...)

The theory of human induced global warming is not a junk theory, your republican is just brainwashed.

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necso Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 05:07 PM
Response to Original message
5. A few Hacks and Flunkies dispute it.
It takes only one bought "scientist" to dispute a scientific claim for the repugs to have some cover.

It is very difficult to sort out the effects of baseline temperature, climate (long term trends) and weather (short term trends). Of course all of these things vary locally and are season dependent.

The near univeral consensus is that the baseline temperature is rising, possibly giving rise to more extreme climate and weather variations. The latter of course make demonstating the former more difficult. (In a strange twist, global warming may give rise to some periods of more intense cold.)

Possible effects of global warming are driving more CO2 out of the oceans and melting large amounts of methyl hydrate in the artic. Both of these events would reinforce the greenhouse effect and perhaps fuel a self reinforcing "race" condition.

As long as he has a lie to hide behind you will never convince a loyal repug (I know --- I used to be one).
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DrWeird Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 05:27 PM
Response to Original message
6. Yes, it's scientific fact.
Some stupid peices of shit like to point out that the globe has been warming since the last iceage 15,000 years ago.

However. Atmospheric levels of greenhouse gasses have skyrocketed in the last hundred fifty years or so since humans started using fossil fuels. And the average global temperature has skyrocketed along with it, at least one degree in the last hundred years. If that doesn't seem that much, consider the fact that if that rate was constant than during the last ice age the world was a hundred and fifty degrees colder. When in fact during the last ice age it was only eight to ten degrees colder.
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Dogmudgeon Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 05:29 PM
Response to Original message
7. Evidence
Global temperature, oceanic temperature, and atmospheric CO2 have been rising for as long as the indices have been measured. Atmospheric CO2 has been accurately measured since the International Geophysical Year (1958-9). Ice core samples, tree ring analysis (dendrochronology) and even alluvial sediment run-off samples have all given weight to the idea that the Earth is getting warmer.

This is not in dispute. To think otherwise is, indeed, "junk science", that most sacred utterance to a militant Republican.

Is it all the fault of humans? Probably not; after all, we have been in an "interstadial" (non-ice-age) period for over 12,000 years, and interstadials have been avergaing less than 10,000 years over the last 2.2 million years. But it is looking more and more like we are accelerating the trend.

Like any complex system, the climate oscillates, which is why it is getting warmer, and paradoxically, this can bring on an ice age.

One of the big pieces of this climatic "oscillator" is that a warmer climate causes more ice to melt, diluting ocean currents. When the currents become dilute, they are less able to transport and distribute heat. Eventually, this "heat pump" effect stops, making the tropics warmer and the poles much colder. The equatorial heat drives moisture toward the poles, where it eventually falls as snow and packs down to ice. And very quickly, an ice age is born. It appears to end when the seas become so salty that heat transfer becomes very intense, so there is a climatological "hysteresis effect" that takes about 100,000 years to kick in. (And, yes, there are other factors that are involved in the process.)

Sorry for all the jargon; but it doesn't take much of a search on Google to find these things out, and if your Republican mini-pundit wants to disgorge his talking points, he should at least make the effort to look at the issue. If he says he's studied it thoroughly, as many Conservatives like to say they do, ask him what scientists have made what points. There's only four or five "Big Names" in climatology, and if he doesn't know a single one of them, he's giving you a snow job. You yourself could look them up in about an hour; Dr. Broecker is one of these Big Names.

Next time your GOP pal says that there is no global warming, you can call him on believing "junk science" to promote a political agenda.

--bkl
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On the Road Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 05:39 PM
Response to Original message
8. The Question is Not "If" but "How Much is Due to Humans"
Edited on Thu Jan-15-04 05:42 PM by ribofunk
The short answer is that certain gases, like those containing carbon, trap heat in the atmosphere. Human have put huge amounts of carbon in the atmosphere by burning petroleum, raising cattle that release methane, etc.

If you look at average yearly temperatue charts, they have been rising steadily. There's not hard to find on the internet. This is not a random fluctuation. It is a trend.

Global warming works for the same reason that the interior of your car warms up when you park it during the day with the windows up. The windows are opaque to the sunlight coming in. But the light is absorbed and re-emitted as heat. The windows are opaque to heat, so mush of the heat stays in the car.

Global warming can be extremely powerful. The temperature of Venus is 800 degrees higher than it would be without its greenhouse gases (which are a different mix from earth). Mars could theoretically be warmed up by inducing global warming.

Modeling the exact effect of humans on the environment is very difficult because there are so many feedback loops. For example, if the polar ice caps begin to melt, there will be less ice cover, which reflects sunlight back into space, but more cloud cover, which tends to trap heat. (At least I think -- don't quote me on the cloud cover.)

The complexity of the modeling gives skeptics a chance to take potshots at the arguments. (This is the methodology of creationists BTW.) But there's no equivalent scientific theory being refined claiming that the earth is staying the same termperature. The mechanism is known and the trend is observable. It's just a question of how much, how fast.
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seasat Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 06:21 PM
Response to Reply #8
10. Cloud cover is a tough one.
Generally, low cloud cover traps heat while high cloud cover reflects back downwelling irradiance.
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Dogmudgeon Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 06:49 PM
Response to Reply #8
11. Complex system, simpler oscillations
Earlier, I gave the Thermohaline Circulation argument. There's cloud cover, CO2, and literally a hundred other factors. Even the influx of so-called "cosmic dust", which has greatly increased. And, for some reason, the onset of ice ages corresponds with weakenings, losses, and reversals of the Earth's magnetic field.

But many, if not most, of these feedback loops will become gang-synchronized, much like Huygen's clocks synchronizing from being on the same wall. I think that's why the ice ages have such a steady pattern of 100,000 years cold, 10,000 years warm. Nature tends to favor simple resonances emerging from complex systems.

One question for the hard-core geeks out there: Was the Younger-Dryas a mini Ice Age after the main event had passed, or was the warm period right before it the fluke? Which brings the question, are we on the brink of a major climate change, or merely a "Little Ice Age"?

Finally, do I think Mankind has had anything to do with what's going on? Absolutely. We've amplified the warming trend to an unnatural degree. We're like a big kicker mechanism that's been placed in the system. What might have taken another 1000 or 2000 years to take place may now occur Any Time Now.

Any "feedback" about this?

--bkl
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dutchdemocrat Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 07:37 PM
Response to Original message
13. I have a friend who just came back from Milan.
The following article was written by someone I know who attended the recent 9th Conference of Parties to the United Nations Framework Convention on Climate Change in Milan, Italy. It's not pretty.


Hello ****

The following is a report to members, et al. I think you may be interested.

The "climate talks" have two official faces: the Kyoto
Protocol--which most newspaper-reading Americans know has been rudely
rejected by the Bush administration--and the much less visible annual
meetings, the "Conferences of the Parties," at which the critical
negotiations take place. What most Americans do not know is that the
overall legal framework here is set by the UNFCCC, and that it,
rather than Kyoto, is the reason the negotiations have held together.

There's something else you must know about the UNFCCC--it divides
the world's nations into two, establishing this division as one
between "Annex 1" and "non-Annex 1" countries (the first are listed
in an annex to the main treaty). In so doing, it reflects the
historic division between "developed" and "developing" countries,
though in an odd and imperfect way that reflects the political
compromises that underlie the UNFCCC: Annex 1, for example, excludes,
in spite of their wealth and high per capita emissions, the "Asian
Tigers" and other relatively rich developing countries such as Israel
and the Mid-East OPEC nations.

This division has had consequences. In the negotiations leading up
to the Earth Summit, the European Union and many other countries
favored the establishment of national "targets and timetables" for
the reductions of greenhouse gases. But these national
caps--quantified emission limits of exactly the type embodied in the
subsequent Kyoto Protocol--were adamantly resisted by the U.S. and
had to be thrown overboard. The result, which we've inherited, was a
viable framework treaty (good), without teeth (bad).

Soon, however, it became quite evident that, without targets and
timetables, the Annex 1 countries' commitment to reduce their
emissions back to 1990 levels by the year 2000 was largely symbolic.
And with the scientific evidence for climate change becoming
increasingly convincing, the need for binding targets had become
clear. However, and herein lies the rub, the vast disparity in
per-capita levels of greenhouse gas emissions (both historical and
current) between the rich and poor countries meant that not all
countries could be expected to take on targets. Thus, it was agreed,
in a text called the "Berlin Mandate" at the first Conference of the
Parties in 1995, that, initially, only the developed Annex I
countries would have binding emission caps.

In the context of the climate negotiations, the Clinton
administration had little choice but to agree to this. But at home in
the U.S., where public knowledge of climate change was minimal, the
fossil-fuel industry mounted a campaign to portray this mandate as
"unfair" to the U.S. because it would have to pay to reduce emissions
while large developing countries like India and China would not. In
1997, with the Kyoto negotiations on the horizon and the
environmental community unable to effectively counter this message,
the Senate voted 95-0 (the Byrd-Hagel Resolution) to assert that it
would accept no treaty that did not also contain binding targets for
the developing countries. In so doing, it effectively repudiated the
Berlin Mandate and set the stage for an ongoing crisis in the
negotiations, a crisis that is now coming to a head.

The U.S. response was twofold. First, Clinton and Gore lobbied hard
for the inclusion in the Kyoto Protocol of "flexibility mechanisms"
which would allow Annex 1 countries to reduce the cost of their
emissions reductions. These include both Kyoto's emission trading
provisions, which allow high-emitting countries like the U.S. to buy
emissions credits from countries with surplus allowances, and the
Clean Development Mechanism, by which Annex 1 countries can invest in
and obtain "credits" for carbon reduction projects hosted in
non-Annex 1 countries. Both of these, by the way, are very long
stories indeed. Second, once Kyoto was negotiated, Clinton never
submitted it for ratification to the Senate, where, of course, it
would have been promptly rejected.

By the rules of the Protocol, it only "enters into force" after it
is ratified by at least 55 countries, including enough Annex 1
countries to account for 55% of combined 1990 Annex 1 emissions. With
the U.S. rejection of the Protocol and its subsequent rejection by
Australia, the only way this was possible was if all other Annex 1
countries ratified. Europe, Japan, and (somewhat surprisingly) Canada
all did in fact do so, and the only country whose ratification is
still required is Russia. However, knowing that they have effective
veto power over the treaty, the Russians have been playing hard to
get, and there are evidently both conflicts in Russia over
ratification and covert efforts by the U.S. to persuade them not to.

Today, after the ninth Conference of Parties in Milan, there's still
widespread belief among climate experts that Russia will in fact
ratify the Kyoto Protocol and that it will enter into force in the
next year or so. Further, much of the climate community's effort is
now going into debates over "next steps," over how to structure a
post-Kyoto agreement that includes both developed and developing
countries. This is an extremely important problem, and the debate is
fascinating indeed, but progress has been made extremely difficult by
the fact that the U.S., the world's largest polluter by far, has
rejected Kyoto and is not taking any significant action to reduce its
emissions. Given this, the developing countries have refused to even
discuss taking on quantified emissions targets similar to those of
Annex 1 countries.

It's widely recognized that a real solution to the climate problem
will require that developing as well as developed countries reduce
their emissions well below current per capita levels. It's a
monumental challenge, and with the Bush administration unwilling to
engage, it is not clear how it can even be approached.

While the U.S. has been the center of resistance, the real enemy is
larger, more diffuse, and more terrifying than even the Bush
administration. It needs a name and "the carbon cartel," though not
ideal (it seems to imply an active, centralized conspiracy, when in
fact it is far more) will do. The term, in any case, is useful to
name the corporations, states, elites, institutions, and capital that
are bound up with the logic and interests of not just oil, but the
whole fossil sector.

Global warming may soon be the greatest challenge our species has
ever faced. So far, unfortunately, this is not widely understood in
either the U.S. (where the denialists are in power, and their allies
control most of the media) or in the South (where the elites still
generally consider global warming to be only a long-term problem).
Nevertheless, the reality is slowly becoming clear: to the Europeans,
who've just suffered a wave of killing weather, to the increasingly
anxious scientists who, staring into their data sheets and
simulations, are seeing a terrifying picture begin to clearly emerge,
and to the activist community, which is finally finding its own way
to the challenges of global warming.

These challenges are manifold, though for the purposes of
simplicity, let's just say that we desperately need a crash global
clean-energy transition, and, indeed, "just and sustainable
development." Unfortunately, both remain largely rhetoric and dreams.
And let's add that, for the most part, and particularly in the South,
the term "development" still conjures images of development-as-usual.
And that this will no longer do.

It isn't going to be easy to clear this up. The rich, after all, did
not become so by developing "sustainably." And development, or at any
rate poverty reduction, from which it still derives its legitimacy,
remains the top priority of the South. Consider that, according to a
recent report from the London School of Hygiene and Tropical
Medicine, the greenhouse body count has already reached 160,000
deaths a year. (The majority of these occur in Africa, Southeast
Asia, and Latin America, where people are highly vulnerable to
malnutrition, malaria, and diarrhea as hotter temperatures settle in
and floods and droughts become more common.) It may seem a huge
number, but to put it in perspective, note that the World Health
Organization estimates that indoor air pollution alone causes 1.6
million deaths per year. That's an even power of ten greater than the
greenhouse body count, and in this case the killer is poverty pure
and simple. Poverty, and with it murderously obsolete heatin
g and cooking technologies.

And the Kyoto Protocol, even if the carbon cartel manages to kill
it, must be seen as the first halting step in the construction of the
most significant environmental and economic treaty of all time.
Because as the climate regime becomes, as it must, a global regime,
it will also become quite impossible for the global justice movement
to proceed as if the greenhouse crisis and the climate treaty are of
merely secondary importance. The challenge, now, is to find a way
beyond the Kyoto Protocol, a way, eventually, to incorporate both the
developing world and the U.S. into an effective and politically
acceptable international climate regime. In this regard, two bits of
jargon, "adequacy" and "equity," must be understood, for between them
they define and contain the heart of the problem.

"Adequacy," in the dialects of the climate world, means facing the
challenge of preventing a dangerous degree of global warming. It
means that, whatever the science tells us, we cannot deny it, not
even if we think that the political and social changes that will
thereby be needed to stabilize the climate are "unrealistic." It
means that, even though a large amount of warming is already locked
in, we must at all costs avoid crossing the line into a world in
which the "impacts" of global warming are no longer "tolerable."

"Equity," of course, means justice. It means "just transitions," in that the rich must pay to help impacted and vulnerable communities "adapt" to the impacts and changes that will soon be upon us (think flooded villages in the global South, or coal miners here in the U.S.). It means that those who are the most responsible for the warming--and this means, again, the rich--must pay to "mitigate" the emissions that cause the warming. And it means that, in a world where the oceans and the skies are clearly revealed as fragile and finite, that these "environmental spaces" must be fairly shared by all and protected as a global public good. It means that emission rights must ultimately be apportioned on the basis of equal per-capita rights.

--
Best regards,
****
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NavajoRug Donating Member (330 posts) Send PM | Profile | Ignore Thu Jan-15-04 07:49 PM
Response to Original message
14. I have to be honest with you. I haven't bought into the whole . . .
. . . "global warming" thing just yet, though I do have an open mind about it.

The major point of dispute is whether the warming trend we've seen over the last hundred years or so has anything to do with human activity. What makes me slightly skeptical are the following two points:

1. A few people have pointed out that the world has been warming up since the last Ice Age, but in fact the earth's temperature has not been consistent over that period of time. Parts of the northern hemisphere were markedly warmer than today for some period of time up until about the 12th century or so. Norse tribes were actually forced to vacate settlements on the coast of Greenland around that time because ice floes made it impossible for them to get supplied from mainland Europe for part of the year.

2. Astronomers will tell you that the polar caps of Mars are shrinking to this day. This clearly does not have a human connection, so there is a well-founded theory that attributes the whole phenomenon of global warming to changes in solar activity more than anything else.
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pmbryant Donating Member (1000+ posts) Send PM | Profile | Ignore Thu Jan-15-04 11:28 PM
Response to Reply #14
15. Your point #2 about the Mars polar caps is based on a nonsensical report


2. Astronomers will tell you that the polar caps of Mars are shrinking to this day. This clearly does not have a human connection, so there is a well-founded theory that attributes the whole phenomenon of global warming to changes in solar activity more than anything else.


This is completely incorrect. Astronomers say no such thing about Mars.

This myth arose a couple years ago when some mainstream news outlets (ABC in particular) published the inane, unscientific, nonsense comments of some engineer who helped build a camera for one of the recent Mars orbiters, and rushed to print with the headlines "Global warming on Mars!"

The supposed evidence was this: 2 pictures, taken one Martian year apart (roughly 2 Earth years), showed that some ice feature had 'moved' by a few meters from one year to the next. The engineer made some silly comments about how this meant the ice caps are melting, Mars is warming up, and it could actually become Earth-like in temperature in a few thousand years if that kept up.

This conclusion and this extrapolation are, obviously, complete nonsense.

It would be like measuring the temperature at some location on Earth at 6am on January 15 in the years 2003 and 2004; finding that the 2004 temperature was 5 degree colder than the year before; and then extrapolating that the Earth would be frozen solid in a few decades.

Science journalism has a bad reputation, but this was the single worst example of it I have ever seen. And apparently its legacy lives on to this day.

:-(

--Peter


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BackDoorMan Donating Member (412 posts) Send PM | Profile | Ignore Thu Jan-15-04 11:41 PM
Response to Original message
16. Read these two links and they will change minds....
http://www.commondreams.org/headlines03/1218-01.htm

Earth Warming at Faster Pace, Say Top Science Group's Leaders
Statement by American Geophysical Union's council warns temperature change is real and human-caused

by David Perlman

Leaders of one of the nation's top scientific organizations issued a new warning this week that human activities -- most notably the greenhouse gas emissions from power plants and other industries -- are warming Earth's climate at a faster rate than ever.

The statement came from the 28-member council of the American Geophysical Union, whose 41,000 members include more than 10,000 experts on the planet's atmosphere and changing climate.


http://news.independent.co.uk/world/environment/story.jsp?story=470838

Measures to fight global warming will have to be at least four times stronger than the Kyoto Protocol if they are to avoid the melting of the polar ice caps, inundating central London and many of the world's biggest cities, concludes a new official report.


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