Jose Luis Alvarez has planted millions of trees to protect the monarch butterfly
The Mexican man who planted a forest
I'm Always on a Mountain When I Fall by Merle Haggard and Fix You by Coldplay.
The former Wimbledon champion answers the questions in the BBC interview series.
The curse of Agent Orange
Vietnam's toxic legacy, smoking warnings ignored and Nazi remains discovered in Brazil.
Can you be a feminist and work as a stripper?
Reaction to a call from the Women's Equality Party for strip clubs to be shut down
Muhammad Ali and Bob Dylan
Carter and Artis get some famous supporters