Greta Thunberg guest edited the BBC’s Today radio show on December 30, 2019. The program (or, since it’s British, the programme) will only be available for a hear after it was posted, so go listen to it now.
It’s an hour long, so TL;DR: Common Dreams has excerpted some … well … excerpts, including Greta and David Attenborough “meeting” through Skype.
But as you listen to her (if you listen to her), remember that she doesn’t want us to listen to her; she wants us to listen to the scientists and the science.

A WRITING PROMPT FROM ME TO YOU: Write about time running out.
MA
