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The changing climate is NOT due to natural variation!
The  enormous body of diverse evidence, the physics and the overwhelming majority of climate scientists publishing in  recognized peer reviewed scientific journals agree that the earth is warming due predominately to  rising atmospheric  levels of anthropogenic C02!

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Doug
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« on: Thursday December 8 2016 13:18:53 AEDT PM »

GLOBAL WARMING AND LIFE ON EARTH
Global warming presents the gravest threat to life on Earth in all of human history. The planet is warming to a degree beyond what many species can handle, altering or eliminating habitat, reducing food sources, causing drought and other species-harming severe weather events, and even directly killing species that simply can’t stand the heat. In fact, scientists predict that if we keep going along our current greenhouse gas emissions trajectory, climate change will cause more than a third of the Earth’s animal and plant species to face extinction by 2050 — and up to 70 percent by the end of the century. Such a catastrophic loss would irreversibly diminish biodiversity, severely disrupt ecosystems, and cause immense hardship for human societies worldwide.
  
link-http://www.biologicaldiversity.org/programs/climate_law_institute/global_warming_and_life_on_earth/index.html
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« Reply #1 on: Tuesday December 13 2016 23:44:49 AEDT PM »

  
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Doug
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« Reply #2 on: Wednesday December 14 2016 10:43:45 AEDT AM »

A few general comments. Firstly  Munkton is not a mathematician and has no recognized scientific qualifications!To find out just how credible he really is on climate science type in dedunking Lord Munkton into google. He is a climate mis informer of the worst kind.
What is important is that climate science and global warming is NOT based on models but on vast amounts of diverse  evidence and on the physics of greenhouse gases.  Atmospheric C02 levels have ranged between about 160 ppm (ice age)and about 260ppm in the warmer more temperate world for at least 800, 000 years. Since the industrial revolution man has added 140ppm of C02 and the global average temperature  has increased by 0.8-1.0 deg C with the fastest increase since about 1980.If we continue a business as usual scenario then by the end of this century we will be looking at atmospheric levels of C02 of 550-600 ppm(likely to be higher due to faster ocean out gassing) more than double the level  prior to the industrial revolution and likely the highest level for 60 million years. The  question is are we prepared to take the risk that these levels of C02 will only add another small amount of warming knowing that if we are wrong then the consequences  may be catastrophic and irreversible?
Even at 2C, (which even Munkton thinks will happen with a doubling of C02) and certainly above it, it is thought that the Earth would cross certain tipping points, beyond which the operation of the Earth System is changed in an irreversible way, at least over timescales of hundreds of thousands of years. The tipping points include the melting of Arctic summer sea ice (which is really gone already), melting of Tibetan glaciers and the Greenland ice-sheet (eventually bringing about six metres of sea-level rise), and destruction of the vast and vitally important Amazon rainforest through dieback and fires.
All of this would be accompanied by a catalogue of catastrophes – extreme weather events, sea-level rise and so on – the harms of which would be magnified many-fold by geopolitical conflict and mass migrations.
Of course global  warming may not be the most serious threat we face from increased atmospheric C02. Ocean acidification is  of even greater concern as more that 2 billion people world wide depend on  healthy marine and reef  ecosystems for food and services. The oceans are becoming more acidic and the deleterious effects  on marine ecosystem already being seen particularly in the arctic regions because C02 is more soluble in cold water,
I suggest that the only prudent  strategy is that we must move  globally towards  reducing C02 emissions and ultimately   move  towards sustainable non carbon production of  energy.
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Doug
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« Reply #3 on: Wednesday December 14 2016 13:37:29 AEDT PM »

  
  
  
link-https://www.youtube.com/watch?v=qJGVvLO2FcU
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« Reply #4 on: Wednesday December 14 2016 19:51:50 AEDT PM »

  

I suggest that the only prudent  strategy is that we must move  globally towards  reducing C02 emissions and ultimately   move  towards sustainable non carbon production of  energy.
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