Yes, if you are referring to the AGW hysteria.
The earth has been cooling for the last 4+ billion years, but it certainly has not been a smooth or uniform trip. There was no permanent ice cap anywhere until one formed in the Antarctic about 15 million years ago (
link). Ice ages occur only in the northern hemisphere (too much open water in the south) and began about 3.5 million years ago, repeating every 40-50 thousand years with no permanent northern ice cap during the warm intervals.
Over the last 900,000 years the earth has gone through ten ice ages spaced at about 90,000 years, which can be correlated to astronomical cycles of the axial tilt, precession, and changes in the eccentricity of the earth's orbit; these cycles have been known since the mid-nineteenth century, and are all explainable by the gravitational effect of other planets. On this cycle, we hit the "first day of summer" about 12,000 years ago, and we are now heading into the next ice age; continuing the "annual" analogy, where summer starts in June but the real hot period comes in late July and August, we can reasonably expect a few more thousand years before the ice starts to advance again and makes the northern latitudes uninhabitable.
On a shorter time scale: there was a warm period in the first few centuries BC when the Norse folk were able to discover and colonize Iceland, followed by a few centuries of cold weather during the period we know as the Dark Ages, followed by a few centuries of Medieval Warm Period when the Norse discovered and colonized Greenland a thousand years ago, followed by a few centuries of Little Ice Age which started to lift in the early nineteenth century.
AGW mythology is based on guesswork about temperatures and climate when the "researchers" go back more than a hundred years or so, and much of the estimated temperature data is based on tree rings which are at least as dependent on moisture as temperature. (See, for example, the current concerns about not enough moisture in Vancouver while too much moisture on the East Coast).
The AGW mythology that humans caused the warming via the industrial age which began around 1800 uses a time span that is far too short; it's a lot like looking at the last couple of months and concluding "OMG!! If we don't do something right now, New York will be under a mile of ice by June of 2013!!!" - completely ignoring the fact that this happens every winter, and resolves itself every summer.
And the AGW mythology relies much too heavily on computer models which use questionable assumptions on the suspect data. These models have (so far) been total failures at predicting 20th century climate from 19th century data, or 21st century climate from 20th century data; it's all hypothetical guesswork with none of the successful predictions which characterize acceptable scientific theories.
I have to admit, though, that AlGore and his acolytes have been extremely successful pitchmen for their Chicken Little theories; they've made a bundle on their doom and gloom nonsense.