From Morningstar:
An initial roadmap for navigating the growing number of "green" funds and ETFs.
...What Does Green Mean?
We've seen several approaches to green investing. We call one style the "best-in-breed" approach, in which the idea is to invest in companies with industry-leading environmental track records. That tack guides Green Century Equity
Investors need to look under the hood and decide for themselves which green strategy they'd prefer. Socially conscious investors may be surprised that not all green funds fit the bill (because they may invest in nuclear power companies, for example). Others seeking the biggest bang for their buck might favor a fund in which management tends to invest strictly where it sees the most attractive growth opportunities....MORE