Manmade global warming, for many, is an Earth-worshipping religion. The essential feature of any religion is that its pronouncements are to be accepted on the basis of faith as opposed to hard evidence. Questioning those pronouncements makes one a sinner. No one denies that the Earth's temperature changes. Millions of years ago, much of our planet was covered by ice, at some places up to a mile thick, a period some scientists call "Snowball Earth." Today, the Earth is not covered by a mile of ice; a safe conclusion is that there must have been a bit of global warming. I don't know the cause of that warming, but I'd wager everything I own that it was not caused by coal-fired electric generation plants, incandescent light bulbs and SUVs tooling up and down the highways.
The very idea that mankind can make significant parametric changes to the Earth has to be the height of arrogance. How about a few questions because temperature is just one characteristic of the Earth. The Earth's orbit is another. If all 6.5 billion of us, all at once, started jumping up and down for a little while, do you think we'd change the Earth's orbit or rotation? Do you think mankind could change the direction and timing of the ocean's tides? Is there anything that mankind can do to stop or start a tsunami or hurricane? You say, "Williams, it's stupid to suggest that mankind could change the Earth's orbit or rotation, ocean tides or cause or stop a tsunami or hurricane!" You're right and it's also stupid to think that mankind's activities can make globalized changes in the Earth's temperature.
Nonetheless, there is much at stake in getting people to subscribe to the global warming religion. There is so much at stake that some scientists, using government grants, are fraudulently manipulating climate data and engaging in criminal activity, as revealed in what has been called "Climate gate." One of the most dangerous features of the global warming religion is its level of intimidation of heretics or would-be heretics.