Bertrand Piccard, Swiss pilot and Chairman of the Solar Impulse sun-powered aircraft company attends a press conference during the COP24 summit on climate change in Katowice, Poland, Tuesday, Dec. 4, 2018. The two-week meeting brings together diplomats and interested pressure groups from almost 200 countries to discuss the 2015 Paris Accord and other climate issues. (AP Photo/Czarek Sokolowski)
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