I talk to Solitaire Townsend, co-founder of Futerra, author, sustainability expert and optimist. She explains how the professionals in PR, Marketing, Accountancy, Lobbying and the Legal profession can smooth the way for the fossil industries and major polluters, or use their power to oppose them. Some are doing both, as she explains.

Other businesses have got the message and are doing all they can - but they're "green hushing". You'll find out what that is.