Paris will at best fix just 1% of the climate problem.

From Justin Lomborg

If we do *everything* that was promised in Paris 2016-2030, we will end up cutting in total 60Gt CO₂e (as in when you translate all reductions into CO₂ equivalents). This is what the UNFCCC – the organizers of Paris – estimate is the maximal committed cuts from all countries.
In order to get to 2°C (the easiest end of the Paris promise), we need to cut 5,760Gt CO₂e over this century.
Thus, Paris will – in the best case – fix just 1% of the climate problem.
In reality, of course, Paris is nowhere on track. A recent Nature review found that “no major advanced industrialized country is on track to meet its pledges”.
So, Paris will likely fix much less than 1%.
Sources:
UNFCC maximal impact of Paris 60 Gt CO₂e:
https://unfccc.int/resource/docs/2015/cop21/eng/07.pdf. On page 10 they estimate a maximal 5.5Gt reduction in 2025, and a maximal 7.5Gt reduction in 2030. Using linear scaling from zero in 2015, that adds up to maximally 60Gt CO₂e 2016-2030.
2°C requires 5,760Gt CO₂e cut:
UNEP Business-as-Usual scenario on page xix emits in total 7,148Gt CO₂e from 2016-2100. https://uneplive.unep.org/…/th…/13/EGR_2015_301115_lores.pdf
This Nature study shows that the average of the likely 2°C emissions paths will need to limit aggregate emissions to 1,388Gt CO₂e.
https://www.nature.com/…/journ…/v5/n6/full/nclimate2572.html
The difference is 5,760Gt CO₂e.
No major nations on track:
http://www.nature.com/…/prove-paris-was-more-than-paper-pro…