International Energy Agency Executive Director Fatih Birol told CNBC Thursday that the main driver of clean energy investment was energy security rather than climate change.

“Today it’s about 1.3 trillion U.S. dollars and it will go up to about 2 trillion U.S. dollars,” Birol told CNBC’s Julianna Tatelbaum.

“And as a result, we are going to see clean energy, electric cars, solar, hydrogen, nuclear power, slowly but surely, replacing fossil fuels.”

Energy security, not climate change, is driving clean energy investment, IEA chief says