Which of the following has a negative radiative forcing (i.e. cools the planet)?
A) nitrous oxides (N2O)
B) carbon dioxide (CO2)
C) Trichlorodifluorome thane (CFC-11)
D) methane (CH4 )
E) stratospheric ozone (O3)
Question 2
The amount of water vapor that can be present in the air is primarily a function of the
A) temperature. B) altitude. C) volume. D) pressure. E) density.