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Global Warming Brings Early Spring
It's all around. Can you see it in the flowers peeking up through the soil? Can you hear it in the birds chirping? Or feel it on the warm breeze? I'm talking about spring, and it's officially sprung. Spring officially arrived last week. But some people say that nature is reacting to spring earlier than ever and that maybe it's because of global warming.
In the American West, the salmon swim upstream earlier than they used to, according to scientists at the Northwest Fisheries Science Center. This can be trouble, because the salmon leave the oceans to head up river and breed. They are doing this 11 days earlier than they did in 1939! This means that they may get hungry too soon.
Salmon aren't the only early arrivals. Butterflies are showing up in California days ahead of schedule. In Colorado, yellow-bellied marmots are coming out of hibernation an entire month earlier than they did in the '70s.
Plants are changing the way they do things too. Way up in Alaska, birch trees are budding 10 days earlier than they did 30 years ago. The spring changes are so big that we can see them from space. Satellite pictures show parts of the planet turning green eight hours earlier every year since 1982.
I'm Adelbert and that's what happened in Science this week!
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