Kicking off a now more than 30-year tradition, Chris Crawford's Balance of the Planet asks players to fix the climate by tweaking a network of policies. You can play the game by heading over to the Internet Archive’s repository of the game.
For some help getting started, see the how to play tips on the festival page
@ChrisCrawford has offered to answer questions about the game and its history here on the community forum. Just ask your questions right here in the thread - Chris will check in from time to time during the festival!