Fate of the World tells a story of what will probably happen if or when the global warming gets out of hand and they let you to be in charge.
The challenge is not a simple one. In charge of GEO, you are faced with all the global problems at the same time from floods and changing weather patterns caused by the global warming, economic crisis caused by the decreasing oil production rate and the social crisis caused by overpopulation. You tackle the problems by instituting 5-year plans. They are represented by issuing policies, i.e. "playing cards", each of which costs money and man power. And if you screw up, you will be lynched or disintegrated by a global nuclear war.
There are six card types, ranging from projects to several kinds of policies. Projects are special long-term actions that let you e.g. start space program or force people to go vegetarian. The policies allow you to do anything from e.g. constructing defenses against warming effects to using extreme measures of population control. These are used to affect the problems represented by charts and statistics available to those of you who want to see the concrete effects.
At first it feels easy to handle the problems. Then the economic crisis because of the lack of oil kicks in and you no longer have enough money to handle everything. Then you have to learn to prioritize or get lynched trying.
There are several scenarios to try out. The basic one, with several variations, is to try to survive until year 2200 battling the global warming and trying to save the humanity, but there's also a scenario where you're actually trying to destroy the world, if you're in a mood for some evil masterminding.
Mood and suspense are big things here, maintained by some awestrucking music and local news from around the world, listed by region. Interface needs a while to get used but most of the action happens anyway in choosing policies and judging, what you can afford and where to concentrate your efforts. One full game takes about two hours of intense thinking to play through, so by the time you're through with your first game you'll already know enough to try that much better again. It's exciting to try different approaches and once you finally manage to survive through the term (even barely), it's a total triumph.