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- 1. Multiple Choice
According to the passage, which gas is generated in especially large amounts when we burn fossil fuels?
carbon dioxide
methane
carbon monoxide
sulfur dioxide
- 2. Multiple Choice
The increase of carbon dioxide in the atmosphere has had which effect on the Earth's climate?
Average rainfall has decreased.
Extreme weather has become less common.
The Earth's temperatures are rising.
The Earth's temperatures are falling.
- 3. Multiple Choice
Arctic ice plays an important role in cooling the Earth.
Which evidence from the passage best supports this statement?
In the last 30 years, more than one-third of the ice that appears in the Arctic during the summer has melted away.
Arctic ice reflects the Sun's light.
When Arctic ice melts, it reveals more of the darker-colored land or ocean water.
Darker-colored land absorbs the Sun's light, causing the climate's temperature to increase.
- 4. Multiple Choice
Some of the gases that contribute to global warming are trapped in permafrost. When permafrost melts, many of these gases are released into the atmosphere. This leads to an increase of the atmosphere's temperature, which causes more permafrost to melt.
What type of feedback loop is this an example of?
negative feedback loop
complex feedback loop
both a positive and negative feedback loop
positive feedback loop
- 5. Multiple Choice
What is the main idea of this passage?
Climate change is a complex and unpredictable process involving feedback loops.
Disagreements about climate change have prevented scientists from finding real solutions to global warming.
Wallace Broecker's theory may have been incorrect, but he presented some worthwhile ideas.
Climate change can be completely reversed if carbon dioxide production is changed.
- 6. Multiple Choice
Read the following sentences:
"Some scientists expect an increase in so-called 'extreme weather' events, such as hurricane and floods. Others foresee a rise in levels of sea water."
Which word could best replace "foresee" as used in this sentence?
forecast
glimpse
pretend
discover
- 7. Multiple Choice
Choose the answer that best completes the sentence below.
Trees play important roles in preventing global warming, _________ absorbing carbon dioxide and pumping water into the atmosphere.
thus
finally
as a result
including
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