Re: Yeah, sure, right.
The climate's been going a bit longer than 150 years and any records older (eg history) are ignored because they often demonstrate fluctuations (eg floods and famines) which may be climate influenced.
By the time Alley and the GISP2 project finished in the early 1990s, they had pulled a nearly 2-mile-long core (3,053.44 meters) from the Greenland ice sheet, providing a record of at least the past 110,000 years. Even older records going back about 750,000 years have come out of Antarctica.
I suppose 750 000 years is a bit longer than 150 years, but what would I know? I'm not so highly privileged as to have been born yesterday.
As valuable as the temperature record may be, the real treasure buried in the ice is a record of the atmosphere’s characteristics. When snow forms, it crystallizes around tiny particles in the atmosphere, which fall to the ground with the snow. The type and amount of trapped particles, such as dust, volcanic ash, smoke, or pollen, tell scientists about the climate and environmental conditions when the snow formed.
Year after year, a steady rain of dust, plants, and animal skeletons settles on the ocean floor. As new materials pile on top of old materials, layers of sediment form a vertical timeline extending millions of years into the past. McManus and his colleagues on the Resolution are drilling long cores of the ocean floor to read the timeline.
Quoting you again:
"a hard-science like climatology" Its about as hard as economics or sociology. Far to many variables many of which are ignored because taking notice of them may be harmful to your argument.
Care to back this up?