Understanding Climate Change: Natural Factors and Human Impact

What is the primary reason the sun cannot be blamed for the current warming trend?

• The sun's energy has no effect on Earth's climate.

• The sun's energy has remained constant over the last century.

• The sun's energy has been decreasing since the 1970s.

• The sun's energy has been increasing since the 1970s.

How do volcanic eruptions generally affect Earth's climate?

• They have no significant impact on Earth's climate.

• They cause long-term warming by increasing solar activity.

• They cool the Earth by reflecting sunlight.

• They warm the Earth by releasing heat-trapping gases.

What percentage of carbon dioxide emissions are produced by volcanic activity compared to human activity?

• 25%

• 10%

• 50%

• 1%

What is the main function of natural climate cycles like El Nino?

• To generate new heat in the climate system.

• To redistribute existing heat within the climate system.

• To cool the Earth by reflecting sunlight.

• To increase the Earth's temperature permanently.

If natural cycles were causing the current warming, what would we expect to see in the ocean's heat content?

• An increase in ocean heat content.

• A decrease in ocean heat content.

• A rapid fluctuation in ocean heat content.

• No change in ocean heat content.

What do Earth's orbital cycles primarily affect?

• The frequency of El Nino events.

• The amount of sunlight Earth receives.

• The amount of volcanic activity.

• The levels of carbon dioxide in the atmosphere.

What historical climate events are caused by Earth's orbital cycles?

• El Nino and La Nina events.

• Volcanic eruptions.

• Solar flares.

• Ice ages and warm periods.

What is the primary cause of the current warming trend according to the video?

• Volcanic eruptions.

• Increased solar activity.

• Natural climate cycles.

• Human activities such as burning fossil fuels.

What effect do human-produced heat-trapping gases have on the Earth's climate?

• They increase volcanic activity.

• They cool the Earth by reflecting sunlight.

• They trap heat, causing the Earth to warm.

• They have no effect on the Earth's climate.

What human activities contribute to the increase in heat-trapping gases?

• Volcanic eruptions.

• Natural climate cycles.

• Increased solar activity.

• Deforestation and agriculture.