Technology investment

Tech Tent: Iron Man’s climate change mission

But Robert Downey Jr has ambitions to play another role - that of an investor in technology to combat climate change.

He tells Tech Tent he wants to step out of the make-believe world of his Avengers character and confront the real threat to the planet.

"I'm not a kid any more. And I really want to find things that I think are dynamic and interesting and - tell me if I'm wrong - but isn't this the space to be catching the buzz right now?"