This process led to a gradual warming of relations between the two countries.

The authors suggest that the gradual warming driven by the earlier carbon release dried out tropical forests, which then burned.

The trapped gases then produce a gradual warming of the earth's atmosphere.

The emphasis is on gradual warming, cleansing and relaxation.

Climate scientists speculate that the gradual warming of the sort we are seeing right now could lead to such a cascade.

Science has shown us that there has been a gradual warming of the earth over the last 50 years.

And there is little doubt that thousands of marine and plant species would be decimated by even a gradual warming.

It had all started with a simple research paper published in 1979, tying carbon dioxide to the gradual warming of the globe.

Superimposed on this long-term, gradual warming were at least two (and likely more) "hyperthermals".

The cause of the gradual warming that preceded the spike 55 million years ago is unknown.