Watch Extreme Environments Tropic

The tropics of the world feature the broadest range of plant and animal life, and tropical forests use intense sunlight to replenish the atmosphere with oxygen and water vapor. The Amazon is referred to as the 'Lungs of the World'; however increases in logging and the population is posing threat to this. Eco-tourism initiatives are being embraced in order to preserve our environment. This episode looks at various tropical rainforests, reefs and deserts around the world.