The Scientific American article below from way back in 2016 points out that we
have already been flirting with 1.5C
(In 2016 CO2 peaked at 403ppm, today it's 418ppm, almost 4% higher.)
and the concentration of atmospheric CO2 keeps rising even though global emission
levels have dropped 17% with economic slowdown and lockdown with covid19.
This is an indication that more CO2 is being released due to the Earth becoming
more of an emission source than a sink
which will be happening even more as the permafrost melts, the oceans release
their dissolved CO2 as they heat more and the rainforest ecosystems collapse with global heating.