What caused global warming from historic times?

Question

we are doing a class project in geography just now and i really cant find a historical cause for global warming! please help!! x

Answer 1

The Sun's axis tilted a special way recently and places like polar bear places were closer to the sun. That made most ice melt.

Answer 2

If there really was Global Warming, there would have a problem in the Western Hemisphere in the 1400-1700 from methane gas from the millions of Bison and in the late 1800 to early 1900 due to the coal fired industrial revolution.......

Answer 3

I recently watched a program on that matter. It stated that the earth's rotation around the sun changes every so thousand years. It changes between a complete circle, to an oval shape. Right now we are rotating at a complete circle, meaning dramatically warmer weather throughout the year, and less cold winters.

Answer 4

Dana correctly identified two known causes.

However that shouldn't be intepreted as meaning that we know all the causes, how each affects the climate and interacts with the other causes, and can fully explain each of the past known warming phases.

We have an idea as to the big picture, that is all.

Answer 5

ROFL. Obviously the cavemen were driving to work in gas guzzling SUV's. Or maybe they did not have CO2 scrubbers in their power plants. They should have gone green sooner, and saved us the hard ship of all this warm weather. we could still be in the middle of an ice age had not the cavemen screwed it up. I hope on their new comedy show, they take full responsibility for AGW.

Answer 6

Climates of the Past

http://www.ncar.ucar.edu/research/climat...

"... the orbits of the Sun and Earth undergo a variety of cyclic shifts over thousands and millions of years. Tiny changes in the tilt of Earth and the asymmetry of its path around the Sun can make a big difference to regional climate—sometimes enough to trigger an ice age."

"Paleoclimate models can look even further back, reproducing slices of atmospheric time from millions of years ago. One NCAR study of the climate 251 million years ago lends support to the notion that a sudden increase in carbon dioxide helped trigger the greatest mass extinction in Earth’s history."

Answer 7

Variations in the Sun's output and Earth's orbital (Milankovitch) cycles, which were amplified by various feedbacks like CO2.