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Hello and welcome to TechTent, your weekly guide to all the hottest news and the most exciting

people in technology. I'm Rory Kethlyn Jones, and this week the Iron Man takes on his biggest

battle aiming to defeat climate change. Hollywood star Robert Downey Jr. tells us why he's putting

his name behind a drive to invest in green technology.

We find out how small investors on a Reddit forum took on Wall Street and won, for now at least.

And have your shopping habits changed in the last year?

A retail expert tells us how the pandemic has shown which shops have managed to adapt to the online revolution.

Joining me this week is BBC's senior tech reporter, senior note, not veteran, Jane Wakefield.

Hi, Jane.

Hello there.

What have you been up to?

Well, I'm just pleased this week that Robbie Downey Jr. has the opportunity to start with me on your amazing show.

...