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We've Already Built too Many Power Plants and Cars to Prevent 1.5 °C of Warming:
In a [...] paper published in Nature today[*], researchers found we're now likely to sail well past 1.5 ˚C of warming, the aspirational limit set by the Paris climate accords, even if we don't build a single additional power plant, factory, vehicle, or home appliance. Moreover, if these components of the existing energy system operate for as long as they have historically, and we build all the new power facilities already planned, they'll emit about two thirds of the carbon dioxide necessary to crank up global temperatures by 2 ˚C.
If fractions of a degree don't sound that dramatic, consider that 1.5 ˚C of warming could already be enough to expose 14% of the global population to bouts of severe heat, melt nearly 2 million square miles (5 million square kilometers) of Arctic permafrost, and destroy more than 70% of the world's coral reefs. The hop from there to 2 ˚C may subject nearly three times as many people to heat waves, thaw nearly 40% more permafrost, and all but wipe out coral reefs, among other devastating effects, research finds.
The basic conclusion here is, in some ways, striking. We've already built a system that will propel the planet into the dangerous terrain that scientists have warned for decades we must avoid. This means that building lots of renewables and adding lots of green jobs, the focus of much of the policy debate over climate, isn't going to get the job done.
We now have to ask a much harder societal question: How do we begin forcing major and expensive portions of existing energy infrastructure to shut down years, if not decades, before the end of its useful economic life?
Power plants can cost billions of dollars and operate for half a century. Yet the study notes that the average age of coal plants in China and India—two of the major drivers of the increase in "committed emissions" since the earlier paper—is about 11 and 12 years, respectively.
[*] Monday.
(Score: 2) by ikanreed on Wednesday July 03 2019, @03:19PM
If you mean the delta y on the graph? probably About 200% right now, though as warming continues there will be some positive feedback loops that will drop it below that.
If we cut our emissions to zero, and let unchecked wildlife growth happen, let all our crop fields go fallow and the like(utterly untennable and no one is proposing it) there's good reason, looking at intra-annual carbon cycles, to believe that net carbon uptake would occur. About 15 billion tons per year uptake. This shouldn't be particularly surprising, trees and brushlands(and oh man corals) hold carbon down a lot longer than cornfields and rice paddies.
If you mean in a strict, disconnected from carbon-cycle point of view, literal masses exhaled by non-farm animals(about 15% of total animal biomass on earth) and produced by geological processes, about 70-90% are anthropogenic.