carbon dioxide

nitrogen

water vapor

methane

in the tropics

in the northern latitudes

impacts of global warming are distributed equally all over the planet

true

false

droughts

flooding

melting of polar ice caps

all of the above

12th

16th

19th

20th

the hole in the ozone

the greenhouse effect

atmospheric pressure

the inversion layer

lower levels of ozone in the atmosphere

lower levels of nitrogen in the atmosphere

higher levels of carbon dioxide in the atmosphere

higher levels of oxygen in the atmosphere

atmospheric carbon dioxide levels have been decreasing since 1960

Hawaii has a lot of carbon dioxide

humans have been working hard to decrease carbon dioxide levels

atmospheric carbon dioxide levels have increased steadily since 1960

Measuring Earth’s current temperature and CO2

Examining ice/glacier melting

Taking educated guesses

The ice caps are getting bigger/growing

New factories were being built that caused more pollution

The civil war caused more pollution

Scientists figured out how to clean up pollution in the air

It did not increase