by Robert Henderson
London Zoo has the precious piece of warmist propaganda cited below plastered all over the zoo. (I reproduce as it appears in the Zoo, the illiteracies and capitalisation being their own).
“ 350 – THE MOST IMPORTANT NUMBER IN THE WORLD
350 parts per million (ppm) of carbon dioxide (CO2) in the atmosphere is the safe upper limit for almost all life
We are currently at 387 ppm and rising by 2ppm per year, higher than at any time in human history
The wild relatives of the amazing animals you see in the zoo today are already at risk from:
Melting poles and glaciers
Rising sea levels
Spread of disease carrying mosquitoes to move, warmer places
Warming and acidifying oceans carbonising coral reefs and other species to extinction
In fact, all life, including life is at peril
The World Association of Zoos and Aquaria supports the urgent call to stabilise atmospheric CO2 as far below 350 ppm as is possible
Visit www.waza.org and 350.0rg “
CO2 is currently “higher than at any time in human history, eh? Well, maybe, but even that fact is far from certain. Take this article in Nature in 2000:
‘Atmospheric carbon dioxide concentrations over the past 60 million years
Paul N. Pearson1 & Martin R. Palmer2
1.Department of Earth Sciences, University of Bristol, Queens Road, Bristol BS8 1RJ, UK
2.T. H. Huxley School, Imperial College, RSM Building, Prince Consort Road, London SW7 2BP, UK
“Knowledge of the evolution of atmospheric carbon dioxide concentrations throughout the Earth’s history is important for a reconstruction of the links between climate and radiative forcing of the Earth’s surface temperatures. Although atmospheric carbon dioxide concentrations in the early Cenozoic era (about 60 Myr ago) are widely believed to have been higher than at present, there is disagreement regarding the exact carbon dioxide levels, the timing of the decline and the mechanisms that are most important for the control of CO2 concentrations over geological timescales. Here we use the boron-isotope ratios of ancient planktonic foraminifer shells to estimate the pH of surface-layer sea water throughout the past 60 million years, which can be used to reconstruct atmospheric CO2 concentrations. We estimate CO2 concentrations of more than 2,000 p.p.m. for the late Palaeocene and earliest Eocene periods (from about 60 to 52 Myr ago), and find an erratic decline between 55 and 40 Myr ago that may have been caused by reduced CO2 outgassing from ocean ridges, volcanoes and metamorphic belts and increased carbon burial. Since the early Miocene (about 24 Myr ago), atmospheric CO2 concentrations appear to have remained below 500 p.p.m. and were more stable than before, although transient intervals of CO2 reduction may have occurred during periods of rapid cooling approximately 15 and 3 Myr ago.”’ http://www.nature.com/nature/journal/v406/n6797/abs/406695a0.html
That is saying that CO2 levels are thought to have remained below 500 ppm for 24 million years or so. That means fully fledged mammals have survived happily enough at higher concentrations than 350 ppm and in the not too distant geological past before that date, proto mammals and of course organic life in general managed to get along with a massive 2,000 ppm of CO2.
The other thing to note is the failure to make any mention of the other main greenhouse gases water vapour (the most prevalent greenhouse gas) and methane. This is a common turning of a blind eye by the warmist religionists. In the case of water vapour they do this because little can be done about reducing it, and in as much as man is responsible for producing water vapour, a great deal results from the creation of paddyfields , something which is done overwhelmingly by developing nations so political correctness kicks in to produce silence amongst Western elites. It is also very inconvenient for the man-made warming argument to have to admit that the most prevalent greenhouse gas is effectively beyond human control. As for methane, that also has a politically direct dimension because paddyfields produce a large amount of the gas.
I particularly enjoyed the plea to reduce CO2 in the atmosphere “as far below 350 ppm as is possible. “ Reduce it very substantially and, others things being equal, we would be heading for an ice age or even an earth which became a permanent snowball. The plea also ignores the fact that CO2 is plant food. Lower CO2 levels means less vegetation which means fewer animals. Atmospheric greenhouse gases including CO2 are necessary to maintain the planet in a state in which humans can live.
What this crass piece of warmist propaganda shows is how closed are the minds of the warmists and how determined they are to proselytise their creed without any regard for logic or scientific research which undermines their case .