But to predict the future—what the Earth might look like at the end of the century—geologists have to look back another 20 million years. Some 55.8 million years ago, massive amounts of carbon dioxide were released into the atmosphere, and temperatures rose by about 9°F (5°C), a period known as the Paleocene-Eocene Thermal Maximum.
To cause to pass into solution: dissolve salt in water. b. To reduce to liquid form; melt. c. Dissolving - definition of dissolving by The Free Dictionary.