greenhouse warming

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.

any number of scenarios have been offered, ranging from the explosion of a nearby star to Ice Age cooling and greenhouse warming.

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

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

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

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

He does not mean that a comparative lack of warming over the past decade shows greenhouse warming has stopped.

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

Or it turns to nitrous oxide in the soil, a gas with roughly 300 times the greenhouse-warming potential of carbon dioxide, pound for pound.

And the human impact on the global environment -- greenhouse warming, mass extinctions and so forth -- is unprecedented, too.

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

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

Hazy cooling and greenhouse warming cannot be traded one for the other;

Potential bias of model projected greenhouse warming in irrigated regions