21.   The Kyoto Protocol set fairly modest targets for reductions in greenhouse gases.

22.   The protocol aimed to cut emissions of greenhouse gases to a few percentage points beneath levels a Decade ago.

23.   There is a growing conviction among many scientists that urgent steps must be taken to diminish greenhouse gases.

24.   Water vapour is a naturally occurring greenhouse gas but the amount of water vapour in the atmosphere is affected by human activities.

25.   Western countries are overwhelmingly responsible for current levels of greenhouse gases.

26.   Wind power is renewable and produces no greenhouse gases during operation.

27.   The talks will centre on the problem of reducing emissions of greenhouse gases.

28.   We know that greenhouse gases can affect the climate.

29.   The rise in greenhouse gases parallels the reduction in the ozone layer.