IBESS 7.2 Climate Change-Causes and Impacts

Greenhouse gases ___ heat emitted from Earth's surface.

• absorb

• reflect

• bounce

Which of the following are greenhouse gases?

• N₂O

• CO₂

• N₂

• HFCs

• CH₄

Which statement BEST describes climate change?

• Humans are adding greenhouse gases to the atmosphere and the additional greenhouse gases trap more heat on Earth.

• Climate naturally changes over time.

• Greenhouse gases trap incoming sunlight and this heats up Earth's atmosphere.

• Humans are adding greenhouse gases to the atmosphere.

Which of the following is the main source of human-made greenhouse gases?

• combustion of fossil fuels

• combustion of nitrogen gas

• cow burps and farts

• decrease of reflective surfaces on Earth

• increase of reflective surfaces on Earth

Answer explanation

Cow burps and farts definitely contribute to greenhouse gases (methane gas), but the biggest contributor to greenhouse gas emissions is from transportation and industry.

What is happening at letter X?

• Sunlight is being reflected off Earth's surface.

• Sunlight is being emitted off Earth's surface.

• Earth's warm surface is reflecting heat into the atmosphere.

• Earth's warm surface is emitting heat into the atmosphere.

What is happening at letter Y?

• Greenhouse gases are absorbing heat from Earth's surface.

• Greenhouse gases are emitting heat from Earth's surface.

• Greenhouse gases are hot.

• Carbon dioxide is a greenhouse gas.

What is happening at letter Z?

• Greenhouse gases are absorbing heat from Earth's surface.

• Greenhouse gases are emitting heat into the atmosphere.

• Greenhouse gases are reflecting heat into the atmosphere.

• Greenhouse gases are radiating sunlight into the atmosphere.

The process shown at letters X, Y, and Z is called ___.

• the greenhouse effect

• greenhouse gases

• radiation

• climate

• weather

Which description best defines climate change?

• Earth is getting hotter.

• Earth's average atmopheric temperature is increasing due to additional greenhouse gases in the atmosphere and the enhanced greenhouse effect.

• Sea level is rising due to additional greenhouse gases in the atmosphere and the enhanced greenhouse effect.

• Albedo is decreasing on Earth due to additional greenhouse gases in the atmosphere and the enhanced greenhouse effect.

Complete the trend statement: As concentrations of atmospheric CO₂ increase, the average global atmospheric temperature _____.

• decreases

• increases

• stays the same

• The answer to this can't be determined.