Recent analysis of NASA satellite data shows that despite the loss of vast tracts of tropical forest, the Earth has grown markedly greener since the turn of the millennium. Researchers at Boston University used satellite data to track the total surface area covered by leaves in the planet’s vegetated zones. They found that between 2000 and 2017, this area gained a number of hectares roughly equal in size to the Amazon rainforest.
Greening is most pronounced in China, thanks mainly to forest conservation and tree planting. However, China is not alone in reforestation efforts. For example, Ethiopia claims that it planted more than 350 million trees in a single day – a world record.
Can reforestation reduce global warming? What costs are associated with large scale reforestation?