Number of people people killed in major wars in the 20th century (moderately pessimistic estimate): 100,000,000
Number of people in the 20th century saved from starvation by green revolution: 1,000,000,000
Average life expectancy in 1900: 35 years
Average life expectancy in 2000: 65 years
Sources: http://en.wikipedia.org/wiki/List_of_wars_and_disasters_by_d... http://en.wikipedia.org/wiki/Norman_Borlaug
Net 900,000,000 lives saved? I'll take that deal any day.