Neutral Existence has freelance writer jobs available for talented writers to help build a large database of environmental articles. They need both exclusive and non-exclusive articles.
They will pay $20-$30 per published exclusive article. Half of the pay is upfront and the other half will be paid at the end of 60 days as long as you haven't published the article anywhere else. The best part is, if they like your work, you have the opportunity to be promoted to a staff writer with a monthly salary.
Non-exclusive or previously published articles are accepted, however Neutral Existence does not pay upfront for them. You can publish them in the resource section with your Google Adsense publisher account and earn money this way.
From the website:
We are currently seeking like minded environmental writers to aid in the development of the Neutral Existence website.
I have not written for this site so have no personal experience to share. However, it seems to be a good opportunity for anyone who can write environmental articles, particularly about global warming. Visit the Neutral Existence Website for more information.