"I want to pause here and talk about this notion of consensus, and the rise of what has been called consensus science. I regard consensus science as an extremely pernicious development that ought to be stopped cold in its tracks. Historically, the claim of consensus has been the first refuge of scoundrels; it is a way to avoid debate by claiming that the matter is already settled. Whenever you hear the consensus of scientists agrees on something or other, reach for your wallet, because you're being had.
Helping is not, as conventionally thought, a charitable act that is praiseworthy to do but not wrong to omit. It is something that everyone ought to do.
In some parts of the world, what you are doing is already apparent. According to the World Health Organization, the warming of the planet caused an additional 140,000 deaths in 2004, as compared with the number of deaths there would have been had average global temperatures remained as they were during the period 1961 to 1990. This means that climate change is already causing, every week, as many deaths as occurred in the terrorist attacks on September 11, 2001.
What we are doing to strangers in other communities right now is, therefore, far more serious and far more widespread than the harm we would do if we were in the habit of occasionally sending out a group of warriors to rape and pillage a village or two. Yet causing imperceptible harm at a distance by the release of waste gases is a completely new form of harm, and so we lack any kind of instinctive inhibitions or emotional response against causing it. We have trouble seeing it as harm at all.
The world does produce enough to feed its inhabitants - in fact we waste vast quantities of grain and soybeans by feeding them to animals, getting back from the animals only a small fraction of the nutritional value of the plant foods we put into them.
I argued against the view that the only obligation we have to strangers is to avoid harming them; but even if we were to take that view, the facts of climate change would demonstrate clearly that we are harming hundreds of millions, perhaps billions, of the world's poor.