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“Climate Change was theorized in 1799, Alexander von Humboldt.”
Please notice that that was 1799…a LONG time ago, they knew !
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“Climate Changed Scientifically tied to Global Warming & Human Activity, physicist & astronomer Simeon Denis Poisson, 1811–1827.”
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“George Perkins Marsh (1801–1882) author of the 1847 lecture that predicted “human-induced climate change.”
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THEY WERE LECTURING ABOUT GLOBAL WARMING and the resulting Climate Changes, in 1847 !
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“The heat-trapping nature of carbon dioxide & other gases was experimentally demonstrated & *PROVED* in the mid-19th century.”
..( these same fundamental experiments are replicated Every year in nearly every college science class 101, around the world ! …they are put up for critique and every science student takes a shot on the science… for decades, no appreciable critique of the science of Global Warming…not in climatology, not in physics, not in Meteorology, etc.)

“….The line of empirical evidence that humans are causing global warming is as follows:
((there will be a test later !)
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We’re raising CO2 levels
Human carbon dioxide emissions are calculated from international energy statistics, tabulating coal, brown coal, peat, and crude oil production by nation and year, going back to 1751. CO2 emissions have increased dramatically over the last century, climbing to the rate of 29 billion tonnes of CO2 per year in 2006 (EIA).
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Atmospheric CO2 levels are measured at hundreds of monitoring stations across the globe. Independent measurements are also conducted by airplanes and satellites. 
For periods before 1958, CO2 levels are determined from air bubbles trapped in polar ice cores. In pre-industrial times over the last 10,000 years, CO2 was relatively stable at around 275 to 285 parts per million. 
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Over the last 250 years, atmospheric CO2 levels have increased by OVER 100 parts per million. Currently, the amount of CO2 in the atmosphere is increasing by around 15 gigatonnes every year.
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(( Instead of 250–285PPM, as it has been for well over 10,000 years, today we are NOW OVER 405PPM ! ))
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(( What has change which has caused this to occur? ))
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Atmospheric CO2 levels and Cumulative CO2 emissions (CDIAC). 
While atmospheric CO2 levels are usually expressed in parts per million, 
here they are displayed as the amount of CO2 residing in the atmosphere in gigatonnes. 
CO2 emissions includes fossil fuel emissions, cement production and emissions from gas flaring.
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((((( Humans are emitting more than 135 TIMES as much CO2 as ALL of the volcanoes on EARTH, each & every year, COMBINED ! )))))
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>> CO2 traps heat. <<
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According to radiative physics & decades of laboratory measurements, increased CO2 in the atmosphere is expected to absorb more infrared radiation as it escapes back out to space.

** In 1970, NASA launched the IRIS satellite measuring infrared spectra. 
** In 1996, the Japanese Space Agency launched the IMG satellite which recorded similar observations.

** Both sets of data were compared to discern any changes in outgoing I.R. energy radiation over the 26 year period

SOURCE: (Harries 2001).

What they found was a drop in outgoing radiation at the wavelength bands that greenhouse gases such as CO2 and methane (CH4) absorb energy. 
The change/reduction in outgoing radiation was consistent with Global Warming theoretical expectations.

** Thus the paper found “direct experimental evidence for a significant increase in the Earth’s greenhouse effect” and Global Warming.

((If Infra Red Energy, does not escape, it is retained in our Earth System as rising temperatures…(( in the Oceans, soil and atmosphere ))

This result has been confirmed by subsequent Research papers using data from later satellites.
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SOURCE: (Griggs 2004)
SOURCE: ( Chen 2007 )
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Change in spectrum from 1970 to 1996 due to trace gases. 
‘Brightness temperature’ indicates equivalent blackbody temperature 
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SOURCE: (Harries 2001).
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When greenhouse gases absorb infrared radiation, the energy heats the atmosphere which in turn re-radiates infrared radiation in all directions. 
Much of it makes its way back to the earth’s surface. 
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Hence we expect to find more infrared radiation heading downwards. 
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Surface measurements from 1973 to 2008 find an increasing trend of infrared radiation returning to earth.
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SOURCE: (Wang 2009) 
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A regional study over the central Alps found that downward infrared radiation is increasing due to the enhanced greenhouse effect.
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SOURCE: (Philipona 2004) 
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Taking this a step further, an analysis of high resolution spectral data allowed scientists to quantitatively attribute the increase in downward radiation to each of several greenhouse gases. 
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SOURCE: (Evans 2006) 
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The results lead the authors to conclude that “this experimental data should effectively end the argument by skeptics that no experimental evidence exists for the connection between greenhouse gas increases in the atmosphere and global warming.”
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Spectrum of the greenhouse radiation measured at the surface. 
Greenhouse effect from water vapor is filtered out, showing the contributions of other greenhouse gases. 
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SOURCE: (Evans 2006)
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The planet is accumulating heat
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When there is more energy coming in than escaping back out to space, our climate accumulates heat. The planet’s total heat build up can be derived by adding up the heat content from the ocean, atmosphere, land and ice.
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SOURCE: (Murphy 2009) 
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Ocean heat content was determined down to 3000 metres deep. 
Atmospheric heat content was calculated from the surface temperature record and heat capacity of the troposphere. 
Land and ice heat content(eg-the energy required to melt ice)were also included.
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Total Earth Heat Content from 1950. 
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SOURCE: (Murphy 2009) 
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SOURCE: (Ocean data taken from Domingues et al 2008.)
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From 1970 to 2003, 
the planet has been accumulating heat at a rate of 190,260 gigawatts with the vast majority of the energy going into the oceans. 
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Considering a typical nuclear power plant has an output of 1 gigawatt, imagine 190,000 nuclear power plants pouring their energy output directly into our oceans. 
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What about after 2003? 
A map of of ocean heat from 2003 to 2008 was constructed from ocean heat measurements down to 2000 metres deep .
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SOURCE: (von Schuckmann 2009)
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Globally, the oceans have continued to accumulate heat to the end of 2008 at a rate of 0.77 ± 0.11 Wm?2, consistent with other determinations of the planet’s energy imbalance.
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SOURCE: (Hansen 2005)
SOURCE: (Trenberth 2009).

The planet continues to accumulate heat.

1. So we see a direct line of evidence that we’re causing global warming. Human CO2 emissions far outstrip the rise in CO2 levels.

2. The enhanced greenhouse effect is confirmed by satellites and many surface measurements.

3. The planet’s energy imbalance is confirmed by summations of the planet’s total heat content and ocean heat measurements….”
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Although temperatures had been running lower than the central estimate of IPCC projections in recent years, they were, and are, still within the projected ‘envelope,’ as shown in the figure above and discussed at length in the linked articles.
Moreover, I added, there was and is a long track record in the scientific literature of successful predictions by climate models. It was collected and documented by Barton Paul Levenson (also linked in sidebar.)

I quoted Barton as follows below,
Multi National Global Climate Computer Models 
have SPOT-ON-ACCURATELY predicted:
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That the globe would warm, and about how fast, and about how much.
That the troposphere would warm and the stratosphere would cool.
That nighttime temperatures would increase more than daytime temperatures.
That winter temperatures would increase more than summer temperatures.
Polar amplification (greater temperature increase as you move toward the poles).
That the Arctic would warm faster than the Antarctic.
The magnitude (0.3 K) and duration (two years) of the cooling from the Mt. Pinatubo eruption.
They made a retrodiction for Last Glacial Maximum sea surface temperatures which was inconsistent with the paleo evidence, and better paleo evidence showed the models were right.
They predicted a trend significantly different and differently signed from UAH satellite temperatures, and then a bug was found in the satellite data.
The amount of water vapor feedback due to ENSO.
The response of southern ocean winds to the ozone hole.
The expansion of the Hadley cells.
The poleward movement of storm tracks.
The rising of the tropopause and the effective radiating altitude.
The clear sky super greenhouse effect from increased water vapor in the tropics.
The near constancy of relative humidity on global average.
That coastal upwelling of ocean water would increase.

Seventeen correct predictions? Looks like a pretty good track record to me.
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47% of Species have already been disturbed/driven out of their native habitat.

http://www.nationalgeographic.com/magazine/2017/04/seven-things-to-know-about-climate-change

http://www.bbc.com/future/story/20170403-miamis-fight-against-sea-level-rise

https://data.giss.nasa.gov/gistemp/graphs_v3/

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