Here’s the basic problem for conservation at a global level: food production, biodiversity and carbon storage in ecosystems are competing for the same land. As humans demand more food, more forests and other natural ecosystems are cleared, and farms intensify and become less hospitable to many wild animals and plants. Therefore global conservation, currently focused

Comment: Back to nature
In a century we may need 80 per cent fewer acres to feed the world – if the technology pans out