Yes, absolutely there are cyclical climate changes. If you really want to see true scientists discussing them, and their relation to the late 20th century trend, go here.

Bottom line (agreed to by ~95% of scientists): "the late 20th century is anomalous in the context of last millennium, and possibly the last two millennia."

Wally Broecker of Lamont-Doherty said nearly 20 years ago - "...if we wait until it is 100% proven that humans are affecting Earth's climate, it will probably be too late to do anything about it..."

And 20 years later, 95% isn't high enough for the politically-driven fools.