Global warming. Man-made or not?

[Darwinian]

Whilst it is true that humans are dumping huge amounts of CO2 into the atmosphere it is also true that CO2 is not a particularly good greenhouse gas.

Other factors must also be considered such as the Earth rotation about its axis, sun spots, variations in the solar winds which affect cloud formation on the Earth thus affecting the amount of sunlight actually reaching the planet.

If rising CO2 is responsible for a warming of our climate why do the ice sheet records show just the opposite?

I must admit that I am a bit out of date regarding the current scientific thinking on this but it always amuses me the way some people follow this theory with almost religious fervour and those who dare to descent are treated like holocaust deniers.