OK, this is from November 2004, but still…
Frontier Centre: We are all familiar with the modern theory that the world’s climate is getting warmer. Is it?
Tim Ball: Yes, it warmed from 1680 up to 1940, but since 1940 it’s been cooling down. The evidence for warming is because of distorted records. The satellite data, for example, shows cooling.
FC: Could you summarize the evidence that suggests the world is cooling slightly, not warming up?
TB: Yes, since 1940 and from 1940 until 1980, even the surface record shows cooling. The argument is that there has been warming since then but, in fact, almost all of that is due to what is called the “urban heat island” effect — that is, that the weather stations are around the edge of cities and the cities expanded out and distorted the record. When you look at rural stations — if you look at the Antarctic, for example — the South Pole shows cooling since 1957 and the satellite data which has been up since 1978 shows a slight cooling trend as well.
Even in 2004, rural stations and the satellite data showed warming.
Be careful what you write in comments, Ball might sue you.