Because it's too late. Unless magic non-existent carbon capture technology materializes soon, we're basically fucked.
https://www.vox.com/2016/10/4/13118594/2-degrees-no-more-fos...
Check out that middle graphic. If we really want to avoid 1.5 degrees, and we can’t rely on large-scale carbon sequestration, then the global community has to zero out its carbon emissions by 2026.
Ten years from now.
That article is two years old and, to state the obvious, global CO2 emissions are not on track to reach zero in the next eight years.
