The Sandbox, by Pixowl, has a new update that introduces the new Ecology 2 campaign, along with some other stuff (naturally).
The campaign includes 17 levels with new contamination mechanics and new Forces of Nature to play with. You'll need to help the people of the world with energy sources like Coal, Uranium, Wind, and Water. You'll even get to play with volcanoes and solar rays.
You can check out the brand new Ecology campaign in The Sandbox rightnow.