There’s 50 percent more carbon dioxide in the air than before the Industrial Revolution.
...Even if global emissions were brought down to half of their current value, we would still continue to add carbon dioxide to the air, causing further warming.
“You need to bring them essentially down to zero in order to stop warming,” Mr. McNeall said.
How much more warming will occur depends on how long it takes for this to happen.
On one hand, clean energy investments are booming, and renewable energy production is rising globally. But energy demand is also projected to rise, coal power plants are still being built, and some sectors of the economy — like construction and manufacturing — are harder to decarbonize, making the task ahead a steep challenge.
Even if the world exceeds the 1.5-degree threshold, “every fraction of a degree matters,” Mr. McNeall said.
“The closer that you can get to that threshold, the better.”
nyt
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