Global Warming - Climate Change

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The Aquila
Posts: 91
Joined: Sun Mar 10, 2019 11:12 am

Global Warming - Climate Change

Post by The Aquila » Wed Jul 17, 2019 11:39 am

After listening to the somewhat ill informed Extinction Rebillion protesters over the week, i thought i would look a little into "global warming". It seems that they are way off the mark when they say that "We" are the greatest contributors. I guess that being the only things on the planet they could be right, but then again....

"Earth's climate and the biosphere have been in constant flux, dominated by ice ages and glaciers for the past several million years. We are currently enjoying a temporary reprieve from the deep freeze."

"Over the past 750,000 years of Earth's history, Ice Ages have occurred at regular intervals, of approximately 100,000 years each."

"Periods of Earth warming and cooling occur in cycles. This is well understood, as is the fact that small-scale cycles of about 40 years exist within larger-scale cycles of 400 years, which in turn exist inside still larger scale cycles of 20,000 years, and so on."

"Climate change is controlled primarily by cyclical eccentricities in Earth's rotation and orbit, as well as variations in the sun's energy output.

"Greenhouse gases" in Earth's atmosphere also influence Earth's temperature, but in a much smaller way. Human additions to total greenhouse gases play a still smaller role, contributing about 0.2% - 0.3% to Earth's greenhouse effect."

We and future generations can do next to nothing to halt this natural phenomenom...other than raise taxes as an excuse!?

https://geocraft.com/WVFossils/ice_ages.html

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Devil
Posts: 1082
Joined: Wed Dec 28, 2016 8:34 am
Location: Mosfiloti

Re: Global Warming - Climate Change

Post by Devil » Wed Jul 17, 2019 12:32 pm

Sorry, but this is a load of total codswallop generated to justify Pres. Trump's mantra that man is not responsible for climate change.

I'll put it simply: from 15,000 years ago to 200 years ago, the CO2 level in the atmosphere was ~280 ppm ±~15 ppm. From 200 years ago, to the present, it has risen from 280 ppm to ~410 ppm, due largely to man extracting fossil fuels and burning them. By my reckoning, this is an increase of nearly 50%. If there were no CO2 in the atmosphere, the global temperature would have been ~-18°C. With 280 ppm, it averaged about 14°C. Today, it averages about 15°C, but, if we stopped all fossil fuel extraction today, thermal inertia would take it even higher.

The science of this is well established and reading the IPCC reports, the consensus of ~1200 qualified atmospheric scientists, leaves no real doubt that the global temperature is rising from human activities. Yes, there are other factors which play a role, such as the sun>earth distance variations, but these have been factored in by the IPCC.

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