RANDOM THOUGHTS

what evidence that global warming is natural?

The evidence for natural global warming is that it has happened before. This is shown not just by archeological evidence but has happened within the scope of human experience.
A thousand years ago Vikings were raising crops and livestock in Greenland. Obviously, since this is impossible today, the climate was much warmer then than it is now.
This Medieval Warm Period, as it is known, was followed by the Little Ice Age a period of time when the climate was much cooler and which lasted until the middle of the 19th century.
Then came a period of warming which lasted until recent years and which set off the global warming hysteria. Now there seems to growing evidence of a cooling trend. This is hard scientific evidence not computer projections which are used by the global warming phonies.
Let's not succumb to hysteria fostered by charlatans (Al Gore) who exploit people's fears for personal gain.

The fact that global warming has happened naturally before does not mean that it is natural now. The current warming matches models taking into account human effects but not those that only have natural effects, we are producing enough greenhouse gases to produce the warming we are seeing, and the more industrialized northern hemisphere has warmed oer the pas century more dramatically than the southern hemisphere.

Does the cooling observed in the past few years match the models too? I don't think so.