2010s Were The Decade That Science Confirmed Just How Big Climate Risks Are, And How Fast
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At the start of the decade, it was unclear how fast the Greenland and West Antarctic Ice Sheets would melt. As recently as the 1990s, melting of the Greenland Ice Sheet was balanced by the buildup of new snow and ice, offering some hope that sea level rise would be slow, allowing coastal communities time to adapt.
By the end of 2019, a study published in the scientific journal Nature showed the Greenland Ice Sheet was melting seven times faster than it had been in the 1990s. That's on pace with the IPCC's worst-case climate scenario, with Greenland alone contributing 2 to 5 inches of sea level rise by 2100. Another study, looking at evidence in fossilized shells, showed temperatures are very near a threshold that will melt most of the ice sheet.
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Many studies in the second half of the decade showed how important it is to keep the global temperature rise as far below 2 degrees Celsius as possible to avoid triggering tipping points that would have cascading consequences. Arctic sea ice is one of the big concerns. Even now, in its diminished state, the summer Arctic sea ice is a 1.6 million square-mile shield that reflects incoming solar radiation back to space. The more it melts, the more darker-colored ocean can absorb heat, speeding up the planet's overall warming.
At 2 degrees Celsius warming, Arctic Ocean sea ice will probably melt completely, said National Snow and Ice Data Center climate researcher Walt Meier. "Some ice probably will persist if warming is limited to 1.5 degrees Celsius," Meier said. He noted that research has suggested the ice could recover fairly quickly—if greenhouse gas concentrations are reduced enough to drop the temperature.
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https://insideclimatenews.org/news/27122019/climate-science-decade-2019-year-review-tipping-points-jet-stream-ocean-circulation