Which of the following gases DOES NOT trap heat?

• carbon dioxide

• water vapor

• nitrogen

• methane

Which of the following have been linked to climate change? 

• droughts

• melting of polar ice caps

• flooding

• all of the above

What is NOT true about the Paris Agreement on Climate Change?

• Countries decide their own how much they want to contribute in reducing carbon emission.

• Countries' commitments are reviewed by the UN every 5 years.

• The agreement has been signed by more than 190 countries.

• It was adopted at the COP 27 (Climate Change Conference) in Paris, 2017.

Answer explanation

The Paris Agreement was adopted at COP 21 in Paris, 2015.

The average temperature of the surface of Earth has increased approximately 1°C in the past century. Which reason best explains this increase in temperature?

• lower levels of ozone in the atmosphere

• lower levels of nitrogen in the atmosphere

• higher levels of carbon dioxide in the atmosphere

• higher levels of oxygen in the atmosphere

Which is a primary energy source used by power plants to generate electricity?

• coal

• gasoline

• wood

• batteries

Which of the following is the best conclusion that can be made from this graph?

• atmospheric carbon dioxide levels have been decreasing since 1960

• humans have been working hard to decrease carbon dioxide levels

• Hawaii has a lot of carbon dioxide

• atmospheric carbon dioxide levels have increased steadily since 1960

Compared to other greenhouse gases, carbon dioxide is very effective in trapping heat near the surface of the Earth.

• True

• False

How does the greenhouse effect work?

• Greenhouse gases reflect the sun's energy, causing it to warm the Earth.

• Greenhouse gases absorb the sun's energy, slowing or preventing heat from escaping into space.

• Greenhouse gases directly warm oceans and cause dramatic weather.

• Oceans absorb greenhouse gases, which cause the Earth's temperature to rise.

Which gas(es) below is/are NOT primarily considered a greenhouse gas? [Choose 1 to 5 options.]

• Carbon dioxide

• Nitrous oxide

• Nitrogen dioxide

• Carbon monoxide

• Methane

Even without human activity, there is naturally occurring greenhouse effect. Without it, the Earth would be ____________.

• 6 to 11°C warmer

• 6 to 11°C cooler

• 28 to 33°C warmer

• 28 to 33°C cooler

Answer explanation

The natural greenhouse effect warms the Earth's surface with energy from the atmosphere. Without the effect, Earth's average surface temperature would be well below freezing.

What's concerning is the current rate of warming due to human activity.

[Source: NASA Climate resource]