This paper was written with Anton Brender as a chapter for the book edited by Jacques Mistral (2015), Le climat va-t-il changer le capitalisme. La grande mutation du XXIème siècle, Eyrolles, pp. 119-132 (“Will climate change capitalism? The great mutation of the 21st century”). Funding volume is important. Yet, in terms both of amounts and financial instruments, finance is globally available. However, its mobilisation faces several hurdles: establish the fight against global warming as a clear policy priority; identify productive investments – financially, economically or socially; and design public intervention as a catalyst to orient savings towards better uses than do unfettered financial markets.