My good friend is ailing with a case of pancreatitis (inflammation of the pancreas).
Pancreatitis can be caused by excessive alcohol consumption or pregnancy.
So my friend is either a drunk, pregnant, or a pregnant drunk (gasp!).
On the other hand, this is merely a demonstration of false logic. While excessive alcoholism is perhaps the major cause of pancreatitis, and pregnancy is a possible cause of it, they are not the only possible causes. There are at least 18 other possible causes. I left them out because my purpose was to raise an eyebrow (especially when he recovers and reads this). It would have been just plain boring for me to say that it was caused by gall stones.
But when people want attention, they'll often create false dilemmas.
The climate is changing. This change (might) be linked to CO2 emissions. Therefore, CO2 emissions is causing the climate to change. Of course in the standard argument, they leave out the parenthesized "might" entirely.
Of course, if your real agenda is to exert control over how free people live, then you need to get them on board. The best way is to make them scared for their lives, so it becomes "Climate change will lead to death; CO2 emissions (might) cause climate change; therefore, CO2 emissions will lead to death!" Leave out all other possibilities (including the possibility that climate change is not caused by humans and that, even if it is, it may not necessarily result in our deaths). Stick to the story and ridicule all critics as either unscientific, illogical, unintelligent, uncaring, foolish, "twisted." or "laughable." Throw in a few clips of polar bears and penguins, and now even children will be upset. In essence, do more spin than science.
The most likely cause of climate change is the same thing that caused it thousands of years ago (when Earth became colder--the Ice Age--and when the Earth became warmer--from the Ice Age to present). Humans couldn't have caused those climate changes, so why are so many ready to pin the current change (which isn't even a change--we've been warming since the Ice Age) on humans? The answer is simple: money and power are at stake. Scientists get money if they convince politicians to fund their armegeddon studies; politicians get power if they convince voters that they must seize control over methods of production and consumption.
Of all the possible causes of the current climate change, this is by far the most likely. It contains not only actual evidence (e.g. the climate has changed before without human help), and it gives a rather likely argument against those who argue the contrary. All these things are true. The climate has changed before, and human beings will sometimes lie, cheat, and steal to get what they want.
Remember again that the stars never lie, but astrologers do.
For the record, my friend, while he really is suffering from pancreatitis, is neither a drunk nor is he pregnant.