The human body has developed sophisticated responses to a range of threats, such as heat, cold, hunger, thirst, and danger.
Global warming scientists have warned that heat levels in South Asia, home to some 1.5 billion people, could reach uninhabitable levels by 2100. India, Pakistan and Bangladesh would be the worst affected regions.
So Stephen Hawking says we'll need to get off-planet within 100 years. He may be right, or not. We may live on Mars or the moon, or not. Either way, space is physically tough on humans. Will we biologically evolve?
More than 20 people were recently sickened by anthrax in Siberia. It's thought a heat wave thawed permafrost there, releasing the bacteria. What else could climate change unleash from frozen ground that's melted?
Oceans cover more than two-thirds of our planet and give us food, energy and other resources. But worldwide, this fantastic underwater world is in danger. Is there still time to prevent the worst?
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