Wilson estimated that 30,000 species per year (or three species per ... With enormous, cheap energy at its disposal, the human population grew rapidly from 1 billion in 1800 to 2 billion in 1930, 4 ...

Populations of terrestrial species declined by 38 per cent between 1970 and 2012. The majority of Earth’s land area is now modified by humans, which has had a large impact on biodiversity. However, ...

How are Endangered Species Identified ... A series of quantitative criteria is measured for inclusion in these categories, including: reduction in population size, geographic range size and ...