Choose A, B, C, or D that best completes each sentence.

Sea level rise is usually regarded as Viet Nam’s main _______: a one-meter rise would submerge 40 percent of the country and make millions homeless.

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All of the disasters resulted from_______ will continue to have a devastating effect on socio-economic development.

Choose the best answer.

Greenpeace works to promote public                of the dangers that threaten our planet today.

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

Pollution can have disastrous effects on the delicately balanced ecosystem.

Choose the best answer.

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

Choose A, B, C, or D that best completes each sentence.

Carbon dioxide is released through _______  processes such as respiration and volcano eruptions and through                        activities such as deforestation, land use changes, and burning fossil fuels.

Choose A, B, C, or D that best completes each sentence.

Methane is a far more active _______ than carbon dioxide, but also one which is much less abundant in the atmosphere.

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.