----- Nội dung ảnh -----
Circle A. B. C or D to indicate the correct answer to each of the following questions

1. Although global warming is causing changes in weather patterns, it is only one aspect of __________
A. global warming B. ecological balance C. climate change D. carbon footprint.

2. Certain __________ in the atmosphere such as carbon dioxide, methane and nitrous oxide, block heat from escaping.
A. effects B. emission C. gases D. layers

3. Most of the jungle was _______________________ to get wood in order to produce paper products.
A. deforested B. threatened C. warned D. emitted

4. A large amount of carbon dioxide __________ are released into the atmosphere by burning fossil fuels.
A. emissions B. carbon footprint C. emit D. greenhouse gas

5. Oil spills are a great ____________________ to the undersea world.
A. threat B. threaten C. threatened D. threatening

6. After we read the report on how the burning of petrol in cars __________ to climate change, we determined to reduce our carbon footprint.