Power Point Presentation

Formative Assessment 1.   Listening

Listen and fill the gaps in the summary:

The graph helps us to distinguish between variations in the climate due to 1. ______ causes and those variations that are induced by human 2.______.

The climate is naturally variable. Occasionally there is a downward trend that is associated with a volcano going off. Then we get to a period, from about 1910, where you can start to see an upward trend, a warming of the climate: 3.______ ______.

Up to this point, you could argue that climate variation can be explained by natural 4.______. That is no longer the case as you get to the latter part of the 20th century. From about 1970 onwards, you can see the red curve and the green curve beginning to diverge. The yellow curve includes human factors: in particular the5. ______ effect, which is mostly caused by carbon dioxide from 6.______ fuel burning.

There seems little doubt that this steep rise in temperature is due to human activity. Without the action of 7.______ ______, there would have been far less 8.______ change since the 1970’s.

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