You will hear a recording. Type the missing words in each blank.

The earth is a hotter place. And it’s (1) ……………………. by the build-up of greenhouse gases like carbon monoxide and (2) …………………. . Like the glass on a greenhouse, these gases let in the sun’s heat but they stop it from (3) ………………….. out. So, the surface of the earth slowly becomes (4) …………………. . These gases have always (5) …………………… naturally in the earth’s atmosphere. But we’re now burning more and more fossil fuels, we’re using more (6) ………….. and coal, and wood too as we cut down more trees.

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