Ex 1: 1->30

______________ is the increase in the temperature on Earth

• Greenhouse effect

• Global warming

• Climate change

• Ecological balance

Although global warming is causing changes in weather patterns, it is only one aspect of ________

• global warming

• ecological balance

• climate change

• carbon footprint.

Certain ______in the atmosphere such as carbon dioxide, methane and nitrous oxide, block heat from escaping.

• effects

• emission

• gases

• layers

_____________ means changes in the earth's weather, including changes in temperature, wind patterns and rainfall.

• global warming

• ecological imbalance

• greenhouse effect

• climate change

Greenhouse gas __________ from factories and vehicles can result in global warming

• emit

• emissions

• effects

• causes

Most of the jungle was ________________ to get wood in order to produce paper products.

• deforested

• threatened

• warned

• emitted

A large amount of carbon dioxide __________ are released into the atmosphere by burning fossil fuels.

• emissions

• carbon footprint

• emit

• greenhouse gas

Oil spills are a great ____________ to the undersea world

• threat

• threaten

• threatened

• threateningly

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

• devote

• contribute

• result

• cause

Too many greenhouse gases in the atmosphere may block heat from escaping into space and trap too much heat next to the Earth's surface causing _______

• another ice age

• global warming

• earthquakes

• volcanic eruptions