What is the most likely scenario that could lead to keeping global climate change to no more than 1.5°C pre-industrial?
a) Decrease in emissions (from 2010 levels) by ~45% by 2030 and reaching net-zero by 2050.
b) Decrease in emissions (from 2010 levels) by ~25% by 2030 and reaching net-zero by 2070.
c) Decrease in emissions (from 2010 levels) by ~25% by 2030 and reaching net-zero by 2050.