I got a chance to play with a really nice set of games created by the Science Museum in England. They have developed a set of really fun games called Futurecade. Some of these games are based some of the real problems of the future. For example, removing land mines using robot drones you have to program (dealing with the real issue of mine removal) or creating strains of e-coli that can clean up oil spills. Others involve teaching genetics by having students care for, nurture, and breed ‘Things’ in the game Thingdom.
Many educational games are little more than regular arcade-style games with some math facts thrown in. These games were created to promote issues in math and science, but also to develop thinking and problem-solving. These could easily be adapted to lessons on global warming, energy, genetics, food distribution, and natural resources. What really makes them great is the optimism that science can solve these seemingly overwhelming problems, and that they allow your students to stand in the shoes of the problem solvers of tomorrow. Good thing too, since they will have to fill that role in the future.