Watch the video about climate change and choose all the correct options.

• According to the speaker, greenhouse gases are produced by the sun's rays and also the actions of people.
• Carbone dioxide is a greenhouse gas.
• Gas is a clean source of energy.
• If the planet gets warmer, we can expect more floods.
• Heating with coal instead of gas can help reduce levels of carbon dioxide.
• If the planet gets warmer, fuel will become less expensive.
• The word "extinct" means to die out and no longer exist.