“One-fifth of carbon emissions comes from illegal logging. And I felt if we want to offer support for the tribes, one of the best ways is to use technology.
“The moment a chainsaw goes off, our mic in the trees picks it up and we can then alert local rangers to stop people in the act.
“We basically take an old cellphone and put it in a box and, using the powerful microphone in most smartphones, listen to the sounds of the forest and detect chainsaws and alert local people.”
One device in a tree can help protect three sq km of rainforest. “That equals taking 3,000 cars off the road and 15,000 tons of CO2.