Some interesting TED talks:

Thorium can give humanity clean, pollution free energy | Kirk Sorensen | TEDxColoradoSprings
https://www.youtube.com/watch?v=kybenSq0KPo

How to green the world’s deserts and reverse climate change | Allan Savory
https://www.youtube.com/watch?v=vpTHi7O66pI

Restoring the ancient Caledonian Forest Alan Watson Featherstone TEDxFindhorn
https://www.youtube.com/watch?v=nAGHUkby2Is