I was listening to NPR on thursday and they had a segment on how video games can change the world. Hear it here. They had Jane McGonigal on who just came out with the book Reality is Broken: Why Games Make Us Better and How They Can Change the World. It was discussing how video games are so much more than the stereotypical shoot and kill ones. She talked about how she helped develop a fast-growing type of video games that turn the players towards positive social goals such as fighting depression, obesity, etc.
She mentioned a free game that is still available online that she developed for the World Bank Institute that challenges the players to address issues such as climate change. It is called Evoke and you can see it here.