How much of the railroads were destroyed in the south as a result of the civil war?

a) one-third

b) two-thirds

c) one-half

d) one-fourth

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