The big picture is hard to impress on a typical human, obssessed with events in ones self centered tiny lifespan. The panic of the 24 hour news cycle screaming with self importance and doom unless we just listen to them dominates.
All reasonable measures say it has been much hotter multiple times in the past, although not in the last 10,000 years.
That doesn't mean its not gonna be a problem if it returns to higher temperatures.
But even though the temperature is certainly going up sharply for the last 30 years that does not mean humans are causing it.
Its three different issues - that's part Al wants to gloss over - that warming, the problems coming from the warming and causation are not the same.
A sure sign of an agenda corrupting science.
Global warming appears to be a natural cycle, nothing more.
The Global Warming pornographers won't like this.
From time to time, Ill ping on noteworthy articles about politics, foreign and military affairs. FReepmail me if you want on or off my list.
The reason this is going to be in the upcoming IPCC ...
... is so they can rewrite the climate history of the planet again.
Just like Michael Mann's Hockey Stick attempted to do away with the Medieval Warm Period and the Little Ice Age, the IPCC will attempt to rewrite the CO2 content of the historical atmosphere.
The 7,000 ppm will be replaced with a nice 450 ppm.
Atmospheric carbon dioxide concentrations are believed to drive climate changes from glacial to interglacial modes, although geological and astronomical mechanisms have been invoked as ultimate causes. Additionally, it is unclear whether the changes between cold and warm modes should be regarded as a global phenomenon, affecting tropical and high-latitude temperatures alike, or if they are better described as an expansion and contraction of the latitudinal climate zones, keeping equatorial temperatures approximately constant. Here we present a reconstruction of tropical sea surface temperatures throughout the Phanerozoic eon (the past 550 Myr) from our database of oxygen isotopes in calcite and aragonite shells. The data indicate large oscillations of tropical sea surface temperatures in phase with the coldwarm cycles, thus favouring the idea of climate variability as a global phenomenon. But our data conflict with a temperature reconstruction using an energy balance model that is forced by reconstructed atmospheric carbon dioxide concentrations. The results can be reconciled if atmospheric carbon dioxide concentrations were not the principal driver of climate variability on geological timescales for at least one-third of the Phanerozoic eon, or if the reconstructed carbon dioxide concentrations are not reliable.