Then you have several options.
Two Mutual Fund families that offer screened Mutual Funds, where the fund manager is careful to pick stocks from firms that meet a certain criteria, ie: good environmental & health history, avoiding weapons makers or companies that historically pollute, etc. are
Domini Funds and
The Calvert Group.
Sensible Investor.com has resources for similar styles as does
Social Funds.comhttp://www.sustainablebusiness.com/">Sustainable Business.com is another site that lists publicly traded companies that fit that sleeve.
I know many DU'rs tout Vanguard and Fidelity Index Mutual Funds, but you must be willing to watch your portfolio rise and fall with the index if you use that type of fund. If the Beta of a fund or your portfolio is at or near 1.00, that means your account balance will rise and
fall just like the index.
My condolences on the loss of your loved one.
Invested wisely and averaging 8% per year, your $400,000 could be almost $2,000,000 in 20 years.
On edit to add the following links;
Barclays iShares and
Invesco Powershares offer Exchange Traded Funds that fit this investment style also. You can find a list of them and other ETF's on the Sustainable Business link above. Just click "Progressive Investor" at the top and then "Sustainable Stocks" on the left. Scroll down for the "Clean Tech Indexes".