Survivors could farm mushrooms on dead trees, or eat rats and insects.
In order to survive, he says, people would need to adopt sunlight-free agriculture — cultivating mushrooms, rats, and insects.
Vincent Kessler/ReutersWhile we're using the wood to grow mushrooms, we could use the dead trees' leaves, too, he said.
Dead trees can feed other life forms, like rats and insectsRats, much like mushrooms, can digest cellulose, the sugar that makes up 50% of wood.
So anything the mushrooms leave behind could be fed to the rats, Walsh suggests.