The film director James Cameron has just completed a dive to Challenger Deep, the deepest point on Earth at nearly 36,000 feet under the sea. His manned descent is the first in 52 years, since the oceanographers Don Walsh and Jacques Piccard explored the Mariana Trench in the bathyscaphe Trieste.
Ancient fossilized raindrops may offer clues to a paradox that's perplexing scientists: the Earth's atmosphere 2.7 billion years ago was similar to the way it is now, even though the sun was younger and dimmer.
The Environment Protection Agency released a draft rule Tuesday that puts new limits on greenhouse gas emissions from any future coal-fired power plants. The technology required to meet the new limits on carbon dioxide is currently so expensive that the rule effectively would put an end to the construction of new coal-fired power plants in the U.S.
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