Speaking of bio, we're now looking at the effects of human consumption on ecosystems. We as a species don't come out well in these lectures. The most depressing PowerPoint slide of the day:
Humans are the dominant species of every ecosystem on earth
- Half of all ice-free land has been transformed by humans
- Humans add more nitrogen to the biosphere than all natural processes combined
- By 2050, humans will double concentrations of atmospheric carbon dioxide
Slow down those Priuses, people.