$13.1 trillion dollars.
"BNEF estimates that another $5.3 trillion in zero-carbon energy investment (on top of the $7.8 trillion) would be needed between now and 2040 to put power-sector emissions on a 2 degree trajectory."
BNEF report, as reported in Vox, June 2016.
"Most of that investment would need to go to India (and Vietnam, and other SE Asian nations), to accelerate the shift from coal to renewables.
"Where’s that extra investment going to come from? What's going to drive it? How will it be structured? If there's to be any hope of averting the worst of climate change, these questions urgently need answers."