Too Little and Too Much

Robert Hunziker quotes an estimate of $200 trillion needed to achieve zero emissions by 2050. Meanwhile, the "production gap" is expected to be twice the level of fossil fuels by 2030 than what would be consistent with the 1.5 degree warming limit.

Increasing Rate of Warming

An article published in Oxford Open Climate Change called "Global warming in the pipeline" finds that the 

decline of aerosol emissions since 2010 should increase the 1970–2010 global warming rate of 0.18°C per decade to a post-2010 rate of at least 0.27°C per decade. Thus, under the present geopolitical approach to GHG emissions, global warming will exceed 1.5°C in the 2020s and 2°C before 2050.

Lead author James Hansen: 

The 1.5-degree limit is deader than a doornail. And the 2-degree limit can be rescued, only with the help of purposeful actions.