Climate change and the carbon cycle

Global warming is the gradual increase in the average ____________ of the Earth.

• temprature

• temperature

• temputaure

• tempeture

Methane and ................ are greenhouse gases.

• oxygen

• nitrogen

• carbon dioxide

The temperature of the Earth is increasing because the concentration of greenhouse gases in the atmosphere is _________.

• increasing

• decreasing

• staying the same

Deforestation (the large scale removal of trees) is increasing the amount of carbon dioxide in the atmosphere. When trees are cut down, they can no longer take in carbon dioxide for ______________.

• photosynthesis

• respiration

• combustion

Deforestation leads to an increase in carbon dioxide levels in the atmosphere. Land cleared by deforestation is often used to rear cattle. Rearing cattle affects further the atmosphere because _________, another greenhouse gas, is released as a product of the cattle's digestion.

• nitrogen

• methane

• oxygen

The graph shows that the global average temperature is rising. One impact of this is that water in the oceans is expanding, causing sea levels to . . .

• rise

• fall

• stay the same

Which of the following actions would reduce carbon emissions?

• walking or cycling instead of driving

• having one person per car instead of carrying passengers

• taking more short aeroplane trips instead of using the bus/train

A large amount of carbon emissions come from burning fossil fuels to heat people's homes. Which of the following could keep homes warm without having to burn fossil fuels? choose 2

• having wooden floors instead of carpet

• fitting loft insulation

• having double-glazed windows

Does the information in the image provide evidence for a link between human activity and increasing carbon dioxide levels in the atmosphere? Justify your answer.

Select yes or no and a justification.

• yes

• no

• It provides evidence that carbon dioxide levels have risen, rather than explaining why they have risen.

• Carbon dioxide levels have gone up. This is because humans are burning more fossil fuels.

Do the graphs provide direct evidence of a link between human activity and global warming? Justify your answer.

Select yes or no and a justification.

• yes

• no

• The increases in carbon dioxide and global temperature follow a similar pattern.

• The increases in carbon dioxide and global temperature follow a similar pattern, but the graphs don't tell you directly how human activity is involved.