Climate Cards is a simple game that looks like a demo or a proof-of-concept, but it's surprisingly compelling to play.  It really hits the nail on the head with simulating rising demands and limited options forcing companies to make decisions that are bad for the environment to keep from going bankrupt, and how in the end, it's either still not enough to stay afloat, or destroys the world and it no longer matters how much money you have.  There's room for improvement and expansion on the concept, but as it is, it's all it needs to be.