The U.S. Justice Department filed a brief in federal appeals court Tuesday to overturn a federal judge's decision that declared the government mask mandate on planes, trains and buses unlawful. Here, a sign stating that masks are required at San Francisco International Airport stands in a terminal after the federal mask mandate was overturned.
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Black or brown hydrogen is extracted from coal. Gray hydrogen is made by heating natural gas. Both create carbon dioxide. Blue hydrogen captures about 90% of that carbon dioxide and stores it, usually underground. Green hydrogen uses renewable energy to split hydrogen out of water using electricity. Pink hydrogen does the same but relies on nuclear power.
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Kenyan mountaineer James Kagambi (C), 62, is welcomed upon his arrival as the first Kenyan who reached the summit of Mount Everest, the world's highest peak of 8,849 meters, at Jomo Kenyatta International Airport in Nairobi, Kenya, on May 23, 2022.
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Green the Chow Chow sits in the grooming area at the 142nd Westminster Kennel Club Dog Show at The Piers on February 12, 2018 in New York City. The show is scheduled to see 2,882 dogs from all 50 states take part in this year's competition.
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ATLANTA, GA - MAY 21: People hold signs during a protest against recently passed abortion ban bills at the Georgia State Capitol building, on May 21, 2019 in Atlanta, Georgia. The Georgia "heartbeat" bill would ban abortion when a fetal heartbeat is detected. (Photo by Elijah Nouvelage/Getty Images)
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