How to halve CO2 emissions by 2040

http://www.businessgreen.com/bg/analysis/3008900/energy-transitions-commission-halving-global-emissions-by-2040-within-reach
http://abonnes.mobile.lemonde.fr/energies/article/2017/04/25/climat-comment-reduire-de-moitie-les-emissions-mondiales-de-co2-en-2040_5116891_1653054.html