31.   The world must reduce the emissions that cause climate change.

32.   There are various possible explanations for climate change.

33.   There is growing concern about climate change.

34.   This enhancement of the greenhouse effect leads to increasing Earth-surface temperatures and global climate change.

35.   To what extent does cutting down trees contribute to climate change?

36.   Various new findings have weakened the position of the sceptics on climate change.

37.   We are now more able to predict future patterns of climate change.

38.   We have been probing the reasons why the government has been so slow to react to the problem of climate change.

39.   We need to assess the impact on climate change.