Global Warming

What is the primary cause of the unusually fast rise in the planet's temperature in the last century?

• Natural climate cycles

• Volcanic eruptions

• Human activity

• Solar flares

Which of the following is a naturally occurring process where gases in the atmosphere trap heat near the Earth?

• Photosynthesis

• Respiration

• The Greenhouse Effect

• Evaporation

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According to ice core readings, which two greenhouse gases have reached their highest levels in the past 420,000 years?

• Oxygen and Nitrogen

• Carbon Dioxide and Methane

• Sulfur Dioxide and Nitrous Oxide

• Water Vapor and Ozone

Which of the following is NOT a predicted consequence of rising global temperatures?

• More frequent hurricanes

• Increased volcanic activity

• Rising sea levels

• Severe droughts