Environmental Science
Which one of the following is the correct percentage of the two green house gases that contribute to the total global warming?

CO2-40%,CFCs-30%
CFCs -14%, Methane-20%
Methane-20%, N2O-18%
N2O-6%, CO2 -86%

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Environmental Science
The north-facing side of a hill in a mountainous region in the US tends to:

All of these
Receive less sunlight during a year than the south-facing side
Have snow on the ground for a longer period of time in winter compared to the south-facing side
Be a better location for a ski run than the south-facing side
Grow a variety of trees that are typically observed at higher elevation

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