×
Log in
Upload File
Most Popular
Art & Photos
Automotive
Business
Career
Design
Education
Hi-Tech
+ Browse for More
The top documents tagged [mass of ddt]
Documents
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%
218 views
Documents
October 12, 1999: 6 billion! Now doubling every 61 years December, 2012: 7 billion!
215 views
Documents
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
221 views