Coral reefs are at times referred to as the

1. Tundra vegetation
2. Rainforests of the sea
3. Equatorial vegetation
4. Tidal reefs

The gas that accounts for nearly half of the greenhouse gases.

1. Nitrous oxide
2. Carbon monoxide
3. Carbon dioxide
4. Sulphur dioxide

The increase in temperature of the earth due to air pollution

1. Climate change
2. Global warming
3. Greenhouse effect
4. Acidification

Which is not a measure to prevent ozone depletion?

1. Increase private vehicle driving
2. Avoid using pesticides
3. Ban the use of dangerous nitrous oxide
4. Strict laws for rocket launches