This Economist clip looks at the extent to which deforestation has generated negative externalities, the causes and consequences of this, as well as the potential solutions to this, at a time when the world is losing 27 football pitches worth of trees every minute.

The clip starts in Costa Rica in the 1980s - where farmers were responsible for large-scale forest clearance, but which is now leading the way in reforestation and sustainable agriculture.

So what are the market-based solutions to this? How can you value trees in a way that promotes sustainable development? And what are the distributional issues involved?

Ending deforestation could reduce annual global greenhouse gas emissions by as much as 30