Severe Weather Could Worsen in Sahel

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triple – v. to make three times as great; to increase by 200 percent

humidity – n. an amount of wetness, especially in the air

rapidly – adj. quickly

greenhouse gas emissions – n. carbon dioxide and other gases that scientists have linked to rising temperatures in Earth’s atmosphere

efficiency – n. the amount of level of effectiveness

meteorology – n. a science that deals with the atmosphere and weather conditions

swath – n. a long, wide area or space

erode – v. to eat away or break down

run off – v. to wash away

percolate – v. to become lively