[cogitator]

There is an assumption here that Global Warming is one thing, and "natural cycles" are another thing.

"Global warming" is generally used to indicate the warming of the globe that has occurred since the mid-1800s. There is considerable scientific evidence that this warming, particularly the warming which occurred in the late 1980s into the 1990s and to present, has been augmented by human activities, particularly those that add CO2 to the atmosphere. CO2 concentration in the atmosphere has increased about 100 ppm since the mid-1800s, and this is about 100 ppm higher than the natural maximum over the past 640,000 years, as determined from measurements of CO2 in ice core bubbles.

Feel free to continue thinking that global warming is entirely natural. The scientific data does not support that line of thinking.

[SlowBoat407]

Feel free to continue thinking that global warming is entirely natural.

It was the last time it happened.

[ClearCase_guy]

The Little Ice Age ran from about 1600 to 1850. Since the mid 1800's we've been coming out of an unusually cold period. (That means the global temerature has been rising, in case you need help.) Global temperatures are not yet at the level they were 1000 years ago when the Vikings had farms in Greenland (a period known as the Medieval Maximum).

Please explain for the class how the Vikings made the world warm, how the Pilgrim caused things to get cold, and how Abe Lincoln managed to heat things up again.

It's a natural cycle.

[tertiary01]

And I'll bet the CO2 in ice core bubbles doesn't degrade one little bit being in contact with all that frozen and often liquid H2O for all that millenia, no sirree. Can you insure that those ice cores came from glaciers in which no liquid water occured in the time the CO2 was trapped?