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| Paris Commitments now put the world on a path of 3.4°C of warming by 2100 (Climate Action Tracker) |
So how does hitting warming of 1.5°C a decade from now square with the 2015 Paris Agreement’s goal of “holding the increase in the global average temperature to well below 2°C above pre-industrial levels and pursuing efforts to limit the temperature increase to 1.5°C”? In two words, it doesn’t.
The Paris text was a political fix in which grand words masked inadequate deeds. The voluntary national emission reduction commitments since Paris now put the world on a path of 3.4°C of warming by 2100 (as illustrated), and more than 5°C if high-end risks including carbon-cycle feedbacks are taken into account.
The Paris outcome is an emissions path continuing to rise for another fifteen years, even though it is clear that “if the 1.5°C limit should not be breached in any given year, the budget (is) already overspent today”. Two years ago, Prof. Michael E. Mann noted: “And what about 1.5°C stabilisation? We’re already overdrawn.”
In fact, the emission scenarios associated with the Paris goal show that warming will “overshoot” the 1.5°C target by up to half a degree, before cooling back to it by the end of this century. Those scenarios rely unduly on unproven Bio-Energy with Carbon Capture and Storage (BECCS) technology in the second half of the century, because the Paris Agreement does not encompass the steep emissions reductions that are required right now.
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