Excellent recap
1. First, the expression "climate change" itself is a redundancy, and contains a lie. Climate has always changed, and always will. There has been no stable period of climate during the Holocene, our own climatic era, which began with the end of the last ice age 12,000 years ago.
In every case, the ice-core data shows that temperature rises precede rises in carbon dioxide by, on average, 800 years. In fact, the relationship is not "complicated." When the ocean-atmosphere system warms, the oceans discharge vast quantities of carbon dioxide in a process known as de-gassing
Carbon dioxide cannot absorb an unlimited amount of infrared radiation. Why not? Because it only absorbs heat along limited bandwidths, and is already absorbing just about everything it can.
Indeed, increased temperature leads to increased evaporation of the oceans, which leads to increased cloud cover (one cooling effect) and increased precipitation (a bigger cooling effect). Within certain bounds, in other words, the ocean-atmosphere system has a very effective self-regulating tendency. By the way, water vapor is far more prevalent, and relevant, in the atmosphere than carbon dioxide -- a trace gas. Water vapor's absorption spectrum also overlays that of carbon dioxide. They cannot both absorb the same energy! The relative might of water vapor and relative weakness of carbon dioxide is exemplified by the extraordinary cooling experienced each night in desert regions, where water in the atmosphere is nearly non-existent.
If not carbon dioxide, what does "drive" climate? I am glad you are wondering about that. In the short term, it is ocean cycles, principally the Pacific Decadal Oscillation, the "super cycle" of which cooling La Niņas and warming El Niņos are parts. Having been in its warm phase, in which El Niņos predominate, for the 30 years ending in late 2006, the Pacific Decadal Oscillation switched to its cool phase, in which La Niņas predominate.
Concurrent with the switchover of the Pacific Decadal Oscillation to its cool phase the Sun has entered a period of deep slumber. The number of sunspots for 2008 was the second lowest of any year since 1901. That matters less because of fluctuations in the amount of heat generated by the massive star in our near proximity (although there are some fluctuations that may have some measurable effect on global temperatures) and more because of a process best described by the Danish physicist Henrik Svensmark in his complex, but elegant, work The Chilling Stars. In the book, the modern Galileo, for he is nothing less, establishes that cosmic rays from deep space seed clouds over Earth's oceans. Regulating the number of cosmic rays reaching Earth's atmosphere is the solar wind; when it is strong, we get fewer cosmic rays. When it is weak, we get more. As NASA has corroborated, the number of cosmic rays passing through our atmosphere is at the maximum level since measurements have been taken, and show no signs of diminishing. The result: the seeding of what some have taken to calling "Svensmark clouds," low dense clouds, principally over the oceans, that reflect sunlight back to space before it can have its warming effect on whatever is below
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