Select the correct answer from each drop-down menu.

tends to raise co2 levels in the atmosphere, but
to lower co2 levels in the atmosphere.

1st blank options
-carpooling instead of driving alone
-cutting down trees instead of growing trees
-reusing an item instead of buying new
-using energy-efficient cars instead of gas guzzlers

2nd blank options
-driving instead of walking
-releasing emissions instead of storing them
-using clean energy sources instead of fossil fuels