But the second study cautions that other, natural factors could stall further warming.
As the water condenses, heat is released, further warming the air and fueling its rise.
And once large areas burn, they release carbon that feeds further warming.
Unfortunately, there seem to be other, much more powerful ones lurking in the event of further warming.
It also promotes the formation of clouds, and generates further warming by dimming the reflective surface of snow and ice.
In some areas, forests could simply disappear, and release large amounts of carbon into the atmosphere, further warming the planet.
Because scientists were wrong then about future temperatures, they might be wrong now about projections of further warming.
For example, a warmer atmosphere holds more water vapor, which is itself a greenhouse gas, adding further warming.
But he said further warming from rising levels of these gases could further stir El Niño and La Niña, and thus global weather patterns.
And over the course of the century, he added, carbon dioxide levels will still have to be reduced to prevent further warming.
First, in color they are darker than the surrounding ice, which means that they retain more heat, and can cause further warming.
