"Global biodiversity decline is best understood as growing numbers of people and their rapidly expanding economic support systems crowding out other species. Conservation biologists standardly list five main direct drivers of biodiversity loss: habitat loss, of species, pollution, invasive species, and climate change. The ' found that in recent decades habitat loss was the leading cause of terrestrial , while overexploitation () was the most important cause of marine losses. All five direct drivers are important, on land and at sea, and all are made worse by larger and denser human populations."