I am not a treehugger, neither am I a gas and coal powered maniac. But global warming does exist and in the long term it is the most influential current affair. :-|
Wrong. The TOTAL effect of human activity on the global climate is so small as to be impossible to measure against the inaccuracy of the data used.
While the climate is indeed changing, that's not because of any human activity but purely due to natural changes that would happen no matter what we did to either accellerate it or slow it down.
For example, the entire benefit of the Kyoto debacle (which will destroy the economies of the countries foolish enough to have comitted to it) will be AT MOST a 0.7 degree drop in average global temperature over a 50 year period.
That's about 3 times smaller than the minimum detectable change over such a period that's statistically significant.
Remember that we're living in an interglacial. That's a period of time between two glacial eras. Such periods can last anywhere from a few thousand to over 20.000 years. We're currently well past the halfway point in one.
The main thing interglacials have in common is wild and unpredictable climate swings. Global average temperatures can varry by as much as 10-15 degrees over a few decades. Other climate factors can varry by similarly large numbers.
You might be surprised that the warmest climate of the last several hundred years was BEFORE the industrial revolution, so before the output of the hated (by the greens) carbon dioxide began in earnest.
The current warming up didn't in fact start until well AFTER the peak of those emissions and have gone down ever since the 1970s in the western world yet the climate isn't getting any colder.
No, I don't worry about the climate insofar as human activity might influence it on a global scale.
Local scale is different, on a spot level human activity can have an influence by changing small scale wind and precipitation patterns but those effects don't translate to larger climate structures.
For example (and an example literally close to home for me), wind turbines will change the wind patterns and thereby the rainfall and temperatures around them for up to several hundred meters. This has led to crops not receiving the amount of rain needed, and thus reduced harvests.