1.   Some scientists continue to argue that natural climatic fluctuations may be responsible for the rise.

2.   Based on the data we have now, one cannot draw any conclusions about long-XXXX term trends because of the natural fluctuations, he said.

3.   And how might natural climatic fluctuations modify and interact with whatever climate changes caused by people are in store for the future?

4.   And, it notes that the national academy still has not decided how much of an effect natural fluctuations in climate have had on global warming.

5.   But no one knows how much of the observed warming is attributable to the heat-trapping gases and how much is caused by natural fluctuations in climate.

6.   They allow ecological forces to work unimpeded and allow the natural fluctuation of animal and plant populations.

7.   Eckert says the increase in nests may be a natural fluctuation.