The Congo Basin rainforest is the second-largest tropical forest in the world, storing large volumes of carbon and hosting high levels of biodiversity. While these forests have historically stayed mostly intact, road development has recently become a critical threat. The Congo Basin rainforest is the second-largest tropical forest in the world, storing large volumes of carbon and hosting high levels of biodiversity. While these forests have historically stayed mostly intact, road development has recently become a critical threat. Environment Phys.org – latest science and technology news stories