Man, this game sucks. They show you what amounts to be an extra depressing trailer of An Inconvenient Truth and then unleashes you on the world - to stop emitting so much CO2.
Usually when a game is set in a post-apocalyptic world, you at least get a gun or a blade (or a gunblade) and have to undermine the oppressive, corrupt regime that has risen in the absence of order. In Planet Green Game, in the face of utter destruction, you take your car in for an oil change.
Everyone knows that the only good educational game ever made was Oregon Trail. Sure, my oxen always drowned while pulling a Conestoga wagon of infection, but it actually made me think... about how much I wanted to hang out in the computer lab instead of going to class.
I remember playing the Oregon Trail on my 4th grade teacher's computer. Made you want for stay inside during lunch!
When I got older, i tried to run out of food on purpose to see if the game would let me go "Donner Party" for dinner. No luck. =(