Understanding Climate Change

What do paleoclimatologists study to understand past climate conditions?

• Volcanic ash layers

• Tree rings

• Air bubbles in ice

• Ocean currents

When did people start recording global temperatures systematically?

• 2000

• 1950

• 1750

• 1880

By how much has Earth's average temperature increased between 1880 and 2000?

• 5°F

• 1.4°F

• 3°C

• 0.8°C

What percentage of the world's glaciers are currently shrinking?

• 100%

• 75%

• 50%

• 95%

How much has the sea level risen since 1880?

• 25 cm

• 18 cm

• 10 cm

• 5 cm