Global warming is devastating oceans and Earth's frozen layers in irreversible ways that directly threaten humanity, UN warns
In this file photo taken on September 6, 2019, a tour boat is seen near the terminus of a glacier in the Kenai Mountains near Primrose, Alaska.
"Even if we manage to limit global warming, we will continue to see major changes in the oceans," Valerie Masson-Delmotte, a researcher at the Laboratory for Climate and Environmental Sciences and an IPCC co-chair, said. The report, a digest of 7,000 peer-reviewed studies, is a sobering reminder that record greenhouse gas emissions, mostly from burning fossil fuels, are driving the planet towards a hothouse climate our species could find intolerable.
All four conclude that humanity must overhaul how it produces, distributes and consumes almost everything to avoid the worst ravages of global warming and environmental degradation. Most threatening of all, accelerating melt-off from glaciers and especially Earth's ice sheets atop Greenland and Antarctica are driving sea-level rise.Since 2005, the ocean has risen 2.5 times faster than during the 20th century. The rate at which the waterline rises will quadruple again by 2100 if carbon emissions continue unabated, the report found.
By 2050, many coastal megacities and small island nations will experience what were formerly once-a-century weather disasters every year — even with an aggressive drawdown of greenhouse gas emissions.
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