Fi Radford invites her fellow septuagenarians to become climate activists and act now for the future of our planet. This talk was filmed at TEDxBristol. All TEDx events are organized independently by volunteers in the spirit of TED's mission of ideas worth spreading. To learn more about TEDxSHORTS, the TEDx program, or give feedback on this episode, please visit http://go.ted.com/tedxshorts.