"Global climate change is being attributed to the atmospheric increase in what two gases produced by human activities?"
w) oxygen and hydrogen x) ozone and methane y) nitrous oxide and sulfur dioxide z) methane and carbon dioxide e) ozone and carbon monoxide
"While many different gases are found in the atmosphere, a number do NOT contribute significantly to solar heating of the atmosphere. Which TWO of the following gases do NOT absorb much heat?"
w) carbon dioxide x) nitrogen y) water vapor z) oxygen