Human Domination of Earth's Ecosystems

"Human alteration of Earth is substantial and growing:
--Between one-third and one-half of the land surface has been transformed by human action;
--the carbon dioxide concentration in the atmosphere has increased by nearly 30 percent since the beginning of the Industrial Revolution;
--more atmospheric nitrogen is fixed by humanity than by all natural terrestrial sources combined;
--more than half of all accessible surface fresh water is put to use by humanity;
--and about one-quarter of the bird species on Earth have been driven to extinction.
By these and other standards, it is clear that we live on a human-dominated planet."