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. - 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