Which of the following was one result of the green revolution?
a. the protection of species diversity
b. the conservation of topsoil
c. an increased reliance on polyculture agriculture
d. an increase in the yield of crops for less-developed countries

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste