1. This means that in a world where greenhouse warming is wetting the atmosphere, the lower parts of the atmosphere should warm at a greater rate than the surface, most notably in the tropics.

2. Of course, without some greenhouse warming, the earth would be a cold, dead place, but too much CO2 accelerates the effect and could make the earth too hot to be habitable.

3. The greenhouse warming and the acid rain also did for the forests and many of the reptiles.

4. The evidence indicates that the polar regions are among the first to detect changes arising from greenhouse warming.

5. "We're looking back farther in time to see where we are trending in terms of greenhouse warming, " said Ballantyne.

6. For those precious ecosystems, ocean acidification is but one of many environmental stresses, an onslaught that includes greenhouse warming, local pollution,[Sentencedict] overfishing and habitat destruction.

7. If so, the current composition and bulk of the moon's atmosphere—sustained by the greenhouse warming of methane—may be a fluke caused by a recent comet impact or an upheaval from the moon's interior.

8. Because in real systems, all these things interact, we just can't know exactly how much of a local change is due to greenhouse warming.

9. NOAA research shows that the tropical multi- decadal signal is causing the increased Atlantic hurricane activity since 1995, and "is not related to greenhouse warming, " the agency said.

10. But, for those of a nervous disposition, the tying of an ancient greenhouse warming to an ancient mass extinction might suggest lessons for the future.

11. You argue that attempts to attribute the degree of local changes, for example declines in individual plant and animal species, specifically caused greenhouse warming are misguided. Why?

12. Thawing permafrost leads to releases of methane and other carbon compounds that can reach the atmosphere and increase greenhouse warming.

13. Hansen said current carbon levels in the atmosphere were already too high to prevent runaway greenhouse warming.

14. The possibility of more climatic variability, though, does not, in itself, mean that greenhouse warming is not happening too.

15. Both, for example, are at the center of the debate over greenhouse warming and hurricane intensity.

16. But the new study, in Proceedings of the National Academy of Sciences, concludes that smog from the extra coal acted to mask greenhouse warming.

17. This was probably the first paper to convince many scientists that they needed to think seriously about greenhouse warming.