Climate Change

No place on Earth is colder today than it was 100 years ago.

• True

• False

Which of the following gases does not trap heat?

• Carbon dioxide

• nitrogen

• water vapor

• methane

As average global temperature rises,

• average precipitation increases

• average precipitation decreases

• average precipitation is unchanged

Where have some of the strongest and earliest impacts of global warming occurred?

• tropics

• northern latitudes

• equally everywhere

Compared to other greenhouse gases, carbon dioxide is the most effective at trapping heat near the Earth's surface.

• True

• False

Some kinds of pollution in the atmosphere can act to cool the planet by reducing the amount of solar radiation that reaches Earth's surface.

• true

• false

Earth has been warmer in the past than it is today.

• true

• false

If you removed the atmosphere's natural greenhouse effect, and everything else stayed the same, Earth's temperature would be:

• 10 to 20°F (6 to 11°C) warmer

• 30 to 40°F (17 to 22°C) warmer

• 10 to 20°F (6 to 11°C) cooler

• 50 to 60°F (28 to 33°C) cooler

How do scientists collect evidence about climate?

• Using remote sensing from space with satellites

• By ground-based measurements of surface temperature, carbon dioxide concentration and sea level

• By collecting "proxy data" from tree rings, ice cores and historical records

• All of the above