Pesticides and the GREEN REVOLUTION can we feed the planet? Since 1950 food grew faster than population: population growth:1.7% per year food growth: 3%
mass of the atmosphere: 5 x 10 18 kg mass of the atmosphere: 5 x 10 18 kg 1 ppm of this is 5 x 10 12 kg Tis is 5 x 10 9 tonnes Or: 5 billion tonnes.
