The other, other global crisis

22 11 2010

Another quick and informative introduction to the problems of over-population and agricultural intensification. Like the nice little video introduction to the importance of biodiversity, if you want to teach someone quickly about why we need to think about over-population, show them this quick video about the other, other global crisis – agriculture.

Highlights:

  • 40 % of the world’s land surface has been cleared for agriculture
  • globally, croplands cover 16 million km2 (area the size of South America
  • humans use 2800 km3 of water to irrigate crops each year
  • fertilizers have more than doubled the P and N in the environment
  • agriculture contributes 30 % of greenhouse gases