Nils Gustaf Ekholm

John Tyndall

Alexander Graham Bell

Svante Arrhenius

CFCs are more efficient at absorbing thermal radiation.

CFCs do not emit from natural sources.

CFCs remain in the atmosphere for only a brief time.

CFCs are more difficult to remove from chimneys and tailpipes.

CFCs circulate through the troposphere more quickly than does.

Nils Gustaf Ekholm

John Tyndall

Alexander Graham Bell

Svante Arrhenius

CFCs are more efficient at absorbing thermal radiation.

CFCs do not emit from natural sources.

CFCs remain in the atmosphere for only a brief time.

CFCs are more difficult to remove from chimneys and tailpipes.

CFCs circulate through the troposphere more quickly than does.

Carbon dioxide, methane, nitrous oxide

Carbon dioxide, helium, nitrogen

Helium, carbon dioxide, water vapor

Carbon dioxide, oxygen, nitrogen

All of these

Carbon dioxide, methane, nitrous oxide

Carbon dioxide, helium, nitrogen

Helium, carbon dioxide, water vapor

Carbon dioxide, oxygen, nitrogen

All of these

The greenhouse effect is also observed on other planets such as Mars and Venus.

The greenhouse effect is only observed on Earth.

The average temperature of the Earth has declined due to the greenhouse effect.

None of these

The greenhouse effect is also observed on other planets such as Mars and Venus.

The greenhouse effect is only observed on Earth.

The average temperature of the Earth has declined due to the greenhouse effect.

None of these

Livestock feedlots and synthetic fertilizers

Natural gas

Deforestation

Wood-burning stoves

Halocarbon gases

Livestock feedlots and synthetic fertilizers

Natural gas

Deforestation

Wood-burning stoves

Halocarbon gases