Global warming

What is a greenhouse gas?

• A gas that cools the Earth

• A gas that is harmless to the environment

• A gas that absorbs and emits infrared radiation

• A gas that is only found in greenhouses

Which of the following is NOT a greenhouse gas?

• Carbon dioxide

• Methane

• Water vapour

• Oxygen

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How do greenhouse gases affect the Earth's temperature?

• They have no effect on Earth's temperature

• They reflect all solar radiation back into space

• They absorb and emit solar radiation, warming the Earth

• They block sunlight completely

What is one consequence of global warming?

• Increased animal populations

• Decreased sea levels

• More stable weather patterns

• Melting ice caps

What does the term 'extinction' mean?

• When a species becomes more numerous

• When a species changes its diet

• When a species moves to a new habitat

• When a species no longer exists