What is the primary human activity that increases the concentration of greenhouse gases in the atmosphere?

• Burning fossil fuels

• Planting trees

• Recycling

• Using solar panels

What is the term used to describe the carbon dioxide released due to human activities?

• Carbon footprint

• Carbon cycle

• Carbon sink

• Carbon offset

According to the passage, what has caused an increase in Earth's average global temperature?

• Increased carbon dioxide in the atmosphere

• Decreased solar activity

• Increased volcanic activity

• Decreased ocean currents

What does the graph in the passage illustrate about the relationship between carbon dioxide and global temperature?

• Increasing CO2 levels are associated with rising global temperatures

• Decreasing CO2 levels are associated with rising global temperatures

• CO2 levels have no impact on global temperatures

• Global temperatures decrease as CO2 levels increase

Which of the following sources is NOT mentioned as a way to gather temperature data?

• Ocean currents

• Satellites

• Tree rings

• Historical records