That'sHernandez
Ominously close to getting banned
- Joined
- Oct 30, 2010
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- 24,683
When i said natural world, I din't mean living world. I was thinking more in terms of climate, chemistry, physics, astronomy. Living creatures evolve and genes adapt, and we find all kinds of creature features which one may interpret as positive feedback. Yet all these systems in living creatures interact with other systems which may stop the positive feedback. So it's not unconstrained, it doesn't runaway.
Here is an example from the world of non-life: atomic nuclear fission. By its nature it tends to all go in one direction and stop. Nuclear fission stops when all actinides have fissioned. No more left. No can do positive feedback anymore. That's why positive feedback mechanisms in climate make no sense. What's to stop the runaway? If the runaway can happen it already did.
Atmospheric oxygen entered a positive feedback loop after photosynthesising organisms started producing it without any organisms yet existing to deplete oxygen from the atmosphere. The atmosphere we have today is in a steady state because oxygen production has reached equilibrium with oxygen depletion.
As an aside, you disregarded my point regarding the release of methane deposits under Siberian ice sheets, stating that methane is not a greenhouse gas. It very much is: https://www.sciencedaily.com/releases/2014/03/140327111724.htm