This game lets you simulate humanity's struggle to stop catastrophic global warming. You have to get Earth's net carbon output to zero before total atmospheric carbon levels reach a point at which human life becomes unsustainable anywhere on the planet. We have the technology to do this today. The real challenge is getting the nations of the world to implement sound policies in a timely fashion. The key to this game is maintaining the support of as much of the world as possible to gain access to the resources you need to build windmills, plant forests, etc. Play the tutorial or watch the video to get a feel for how to play the game...then enjoy!