Reasons to be hopeful: the climate solutions available now 

We know that climate change is a huge problem but we have the knowledge, the tools and the ability to deal with it

A member of the global environmental movement, Extinction Rebellion, takes part in a protest outside the Guildhall, London, earlier this year. 

The climate emergency is the biggest threat to civilisation we have ever faced. But there is good news: We already have every tool we need to beat it. 

The challenge is not identifying the solutions, but rolling them out with great speed.