Re-Begin Re-Transmit: Global warming is due to Natural causes and Humans can NOT control it

World temperatures over the last 10,000 years

Watch 7000 years ago it was pretty hot !

Dry air contains roughly (by volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, and trace amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%.

( Above 2,000 PPM, CO2 starts to become toxic to plants and above 4,000 PPM it becomes toxic to people. )

78% - Nitrogen

21% - Oxygen

1% - Argon

380 ppm CO₂ 0.038%

scientists are fairly certain that a 100 million years ago carbon dioxide values were many times higher than now.

long-term reconstructions of atmospheric CO₂ levels going back in time show that 500 million years ago atmospheric CO₂ was some 20 times higher than present values. It dropped, then rose again some 200 million years ago to 4-5 times present levels--a period that saw the rise of giant fern forests--and then continued a slow decline until recent pre-industrial time.

History of Atmospheric CO₂ through geological time (past 550 million years: from Berner, Science, 1997). The parameter RCO₂ is defined as the ratio of the mass of CO₂ in the atmosphere at some time in the past to that at present (with a pre-industrial value of 300 parts per million). The heavier line joining small squares represents the best estimate of past atmospheric CO₂ levels based on geochemical modeling and updated to have the effect of land plants on weathering introduced 380 to 350 million years ago. The shaded area encloses the approximate range of error of the modeling based on sensitivity analysis. Vertical bars represent independent estimates of CO₂ level based on the study of ancient soils.

How much greenhouse gas was there in the ancient atmosphere? A 1993 model by Jim Kasting of Pennsylvania State University estimates that carbon dioxide (CO2) levels in the Earth's early atmosphere must have been 10 times to as much as 10,000 times today's level, in order to compensate for the young (and fainter) sun. Now, a measurement of the fossil record using a new instrument has confirmed a portion of the model. Atmospheric CO2 level 1.4 billion years ago was at least ten to 200 times greater than today, according to the new research.

The findings are reported in the September 18, 2003, issue of Nature by Alan Jay Kaufman of the geology department at the University of Maryland and Shuhai Xiao of the geosciences department at Virginia Tech ("High CO2 levels in the Proterozoic atmosphere estimated from analyses of individual microfossils").

So presently the co2 levels are at lowest levels …. ??

Having a closer look in a few 100 thousand years the Atmospheric CO₂ looks like …

Plants would benefit from more CO2 in the air today, and actually are benefitting as we burn more fuels, one by-product being carbon dioxide. CO2 in the air has increased from 270 PPM to over 300 PPM, more than an 11% increase, in just the last 40 years!

Trees grow better at higher CO₂levels. Artificially “ green houses “ are created in polythene tents with high CO₂gas in them.

Biologists and plant physiologists have long recognized the benefits of higher CO2 content in the air for plant growth. Horticulturists and greenhouse growers have used CO generators to enhance growth rates on plants for many years with good results.

With the advent of home greenhouses and indoor growing under artificial lights and the developments in hydroponics in recent years, the need for CO2 generation has drastically increased. Plants growing in a sealed greenhouse or indoor grow room will often deplete the available CO2 and stop growing. The following graph will show what depletion and enrichment does to plant growth:

Below 200 PPM, plants do not have enough CO2 to carry on the photosynthesis process and essentially stop growing. Because 300 PPM is the atmospheric CO content, this amount is chosen as the 100% growth point. You can see from the chart that increased CO can double or more the growth rate on most normal plants. Above 2,000 PPM, CO2 starts to become toxic to plants and above 4,000 PPM it becomes toxic to people.

The largest consumer of carbon dioxide (and maker of oxygen) is not trees, it's planktons in the sea.

Most people think that most of our oxygen comes from trees. But with two-thirds of the Earth's surface covered with water, it actually comes from oceans full of plant plankton, who dutifully convert 94% of CO2 to oxygen through photosynthesis.

[ So theoretically even if all the trees of the world is cut off, it hardly affects the Oxygen balance ! while oil spill or sea mining is very injurious to marine life and planktons, thus to oxygen recycling ]

Temperatures over the last 4.6 billion years

Here "Ma" means "million”.

So several times the average temp of Earth became hotter and cooler due to environmental reasons.

Permian extinction 250 million years ago, when about 90% of all species died out. This was much more serious extinction than the "end of the age of the dinosaurs", in which about half of all species died out.

Dinosaur extinction at the end of the Cretaceous was only one of the 5 big extinctions life on Earth has suffered throughout the Phanerozoic eon, which began with the Cambrian period 540 million years ago. You can see the "Big Five" as sudden declines in this graph of biodiversity:

This graph shows how many "families" of marine animals there have been as a function of time. A "family" is a grouping of organisms that's bigger than a genus but smaller than an order.

It is “ high “ human ego to “ preserve “ the status quo. Even though in past due to geological / natural reasons so many species died / got extinct, today most humans would like to see all the species around itself as thriving.

Same thought process works for CO2 levels or Temperature. The status quo must be maintained and nothing should change is the “ common “ opinion.

The Ordovician-Silurian Extinction, 440-450 million years ago at the end of the Ordovician Period.
27% of all families and 57% of all genera went extinct.

This was the second biggest extinction of marine life, ranking only below the Permian extinction. There was only life in the seas at this time, and more than one hundred families of marine invertebrates died, including two-thirds of all brachiopod and bryozoan families. One theory is that as the continent Gondwana drifted over the south pole, there was a phase of global cooling, and so much glaciation took place that sea levels were drastically lowered.

The Devonian Extinction, 375 million years ago at the end of the Frasnian Age in the later part of the Devonian Period.
19% of all families and 50% of all genera went extinct.

By this point there were plants, insects and amphibians on land, fish in the seas, and huge reefs built by corals and stromatoporoids. The continents of Uramerica and Gondwana were just beginning to move together to form Pangea. The extinction seems to have only affected marine life, but 70% of marine species went extinct! Reef-building organisms were almost completely wiped out, so that coral reefs returned only with the development of modern corals in the Mesozoic. Brachiopods, trilobites, and other sorts got hit hard. Since warm water species were the most severely affected, many scientists suspect another bout of global cooling. There may have also been a meteorite impact, but it seems this extinction was not a sudden event.