NASA data through June 2019 confirms an earlier analysis that it could be 1.85°C (or 3.33°F) hotter in 2019 than in 1750. When looking at how much hotter June 2019 was compared to the annual global mean 1980-2015, it was 2.08°C (or 3.74°F) hotter, as the image below shows.
Remember the 2015 Paris Agreement, when politicians pledged to act on the threat of climate change, including by “Holding the increase in the global average temperature to well below 2°C above pre-industrial levels . . . ”
The image at the top also shows that a rapid temperature rise could take place soon. The 2°C (or 3.6°F) guardrail could be crossed soon, i.e. in 2020 when looking the long-term trend (in blue, based on 1880-June2019 data), or in 2019 if the current El Niño strengthens (red trend, based on 2011-June 2019 data).
Furthermore, while the long-term trend points at a 3°C (or 5.4°F) rise by 2026, a 3°C rise could eventuate as early as in 2020 in case of a persistently strengthening El Niño. This could cause a rapid decline of the snow and ice cover around the globe, in turn making that less sunlight gets reflected back into space. Changes to the jet stream could also contribute to a further strengthening of storms, which threatens to push large amounts of hot, salty water into the Arctic Ocean, triggering eruptions of more and more seafloor methane.
[ to be continued soon, please return to this post ]
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