The greenhouse-gas gap can be bridged in 21 measures by 2020.

Kornelis Blok et al, a Dutch team from the University of Utrecht and Ecofys, in Nature: “a new approach — which we call ‘wedging the
gap’ — consisting of 21 coherent major initiatives that together would trigger greenhouse-gas emission reductions of around 10 gigatonnes of carbon dioxide equivalent (Gt CO2e) by 2020. ….A coalition of progressive governments and producers could remove barriers by introducing good grid access and net metering rules, paving the way to add another 1,600 GW by 2020 (growth consistent with recent years). Impact in 2020: up to 1.4 Gt CO2e.”