Giant predatory worms, 50-foot algae, sea spiders and leopard seals are some of the creatures living between the ice and snow of Antarctica. A leading expert on Antarctica explains what's in this fragile ecosystem and why it's under attack.
Climate change is exaggerating the normal swings in weather. For the American Southwest, that means more intense waves of heat, drought and fire that could wipe out trees that have stood for centuries. It's already revamping the ecology of the landscape.
Woodland forest fires are burning with such power and size, no one can remember anything like it. The problem with fires of this intensity is that the forests can't recover — they are completely destroyed.
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