US President Barack Obama started a three-day trip on August 31 at the state of Alaska, making his case for acting on climate change. Alaska has had one of its worst wildfire seasons in memory, and its glaciers - like so many around the world - are melting. It also has experienced record warming over the past several years, which has caused the permafrost that lies beneath many roads and buildings across the state to begin thawing. Much of this has been blamed on climate change.
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