21.   But where is global warming when you need it?

22.   Climatologists do not expect the warming to be smooth and continuous.

23.   During his presidency, the United Nations panel on climate change and the National Research Council have said global warming is real.

24.   ExxonMobil, based in Irving, Texas, opposes the Kyoto treaty and has questioned the validity of scientific evidence that global warming is a real danger.

25.   Few scientists believe there are enough data yet to prove that global warming is responsible, but specialists are keeping a close watch on Antarctica.

26.   For Gore, global warming is nothing less than a call to arms, and his view was shaped long before his first run for office.

27.   Fighting global warming will not be easy.

28.   Global warming could be another factor.

29.   Global warming is a global problem.