Choose the best answer.

A strong greenhouse effect will warm the oceans and partially melt glaciers, increasing ______.

Choose the best answer.

Ocean water also will expand if it warms, _______further to sea level rise.

Choose the best answer.

The clearing of land for agriculture, industry, and other human activities have increased ______ of greenhouse gases.

Choose the best answer.

Conjunctivitis caused by the common cold is very                  and can spread rapidly between people.

Choose the word or phrase that is CLOSEST in meaning to the underlined part in the following questions.

Environmental groups want a substantial reduction in the emission of greenhouse gases.

Choose the word or phrase that is CLOSEST in meaning to the underlined part in the following questions.

Coming on top of the previous years of extreme scarcity of food, however, the longer term economic implications were profound.

Choose the best answer.

                is the gradual warming of the earth because of heat trapped by carbon dioxide and other gases in the atmosphere.