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originally posted by: jrod
a reply to: raymundoko
Which guy have you called me out on?
Tactics straight from the book are what you use.
Why are you guys trying to discredit my facts?
originally posted by: raymundoko
Yes it does...
I'm also not arguing the 280 to 400 either. But isotopes don't lie, and only 4% is ours.
a reply to: jrod
originally posted by: raymundoko
No, 5% is ALL man made co2. Why do you think otherwise?
a reply to: jrod
Increase of 40% FACT
originally posted by: mbkennel
Yeah, so why did it stay around 280 from 8000 BC to 1750 AD?
And so where are the molecules of CO2 from human combustion going? People can approximately count them. In reality almost all the rise is from consequences of human activity---and some of the fossil carbon is being absorbed into the ocean so it would be even worse (if you're not a crustacean) if it all went in the atmosphere.
Ah, I now see the source of your error. You hear about 4% of carbon flux out per year is from humans (which may be true) but there is also a large yearly natural carbon flux back in---and it's the cumulative effect which matters obviously so even if it's 4% per year (considering the size of the biosphere and planet that number is astonishingly large to me!!!) additional the human responsibility for the long-term rise can be much more than 4%.
Co2 was 10's of times higher in the past. A runaway greenhouse was not triggered. The effects of co2 are logarithmic.
Deep in the past, sure. But everything about the climate was different then, and most importantly there were no humans, much less technological civilization supporting 7 billion on the biosphere as opposed to 50,000 in prehistoric times. And climate changes were associated with mass extinctions. Good idea to NOT tempt that.
And most importantly, back then (many millions of years) the Sun was not as hot and did not radiate as much power (known fact of stellar physics) and so the climate would be cooler then with the same CO2 as now, and likewise with very high CO2 now as then the climate would be hotter still.
Nobody is predicting a 'runaway greenhouse' like Venus---because that isn't just catastrophic for humans but all life. It doesn't have to be anywhere near that large for the results to be a huge problem for humans.
Consider that the difference between current climate and deep ice ages was, on average, about 5 C cooler than today. 5 degrees C difference on global average temp meant that glaciers were TWO MILES THICK in New York, and agriculture was infeasible for nearly all of the land on the planet. We're barreling towards a Heat Age of almost a similar magnitude up. You don't think that won't be a tremendous problem?
originally posted by: raymundoko
a reply to: jrod
OK, so you mean indirect. This I can agree with. Deforestation, livestock etc. You kept wording it like burning fossil fuels was the cause of the increase, that is only a small part of it.