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Greenland’s expansive ice sheet is known to be shrinking, especially since the 1990s, because of warming from climate change. It’s a fate shared by the Antarctic Ice Sheet as well as glaciers around the world. Now, a new study reveals that about 20 percent more of the Greenland ice sheet has disappeared than previous estimates show.The missing ice has been breaking and melting from the ends of glaciers around Greenland’s perimeter. The new research, published Wednesday in the journal Nature, provides a detailed accounting of a process that scientists knew was happening but had struggled to measure comprehensively.“Almost every glacier…

Despite staunch resistance from his opponents in the government, the anticorruption crusader Bernardo Arévalo was inaugurated early Monday morning as Guatemala’s president, a turning point in a country where tensions have been simmering over widespread graft and impunity.His inauguration had been scheduled for Sunday, but members of Congress delayed it, and concerns persisted about whether it would happen at all. But after an international outcry and pressure from protesters, Mr. Arévalo was sworn in shortly after midnight, becoming Guatemala’s most progressive head of state since democracy was re-established in the 1980s.His rise to power — six months after his victory…