What do scientists hope to learn from total solar eclipse in US?

When a rare total solar eclipse sweeps across North America on Monday, scientists will be able to gather invaluable data on everything from the sun's atmosphere to strange animal behaviors—and even possible effects on humans.

How much difference can one degree of warming make?

A vicious cycle of warming temperatures and reduced snowpack in northern forests is more severe than climate models have shown and could lead to increased fire risk and permanent damage to ecosystems.

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