OT
Their are hysteresis points in the climate system. The most urgent situation is the loss of Arctic sea ice. Losing Summer sea ice results in an
'albedo flip' leading to rapid warming of the entire Arctic region, and is nearly irreversible without herculean mitigation efforts.
Sea ice reflects 90% of the Sun's energy back into space, whereas open blue ocean absorbs and stores 90% of solar energy. This
albedo flip will hugely affect the energy balance in the Arctic. Once the Summer sea ice cover is removed, ocean warming is locked in, even though it will take time until a new equilibrium is reached.
The sea ice hysterisis effect was studied in this seminal climate science paper:
Eisenman, I., & Wettlaufer, J. S. (2009).
Nonlinear threshold behavior during the loss of Arctic sea ice.
Proceedings of the National Academy of Sciences,
106(1), 28-32.
Fig. 2
"Bifurcation diagram for the partially linearized model, where nonlinear sea-ice thermodynamic effects have been excluded but the ice–albedo feedback has been retained."
In this graph, temperature is on the vertical axis and surface energy imbalance is on the horizontal axis. Once sea surface temps (SSTs) rise above 0 C (melting point of ice), then it requires far less heat imbalance to maintain that ice free state. Meaning that even
severe cut backs on carbon emissions
AFTER losing the Arctic sea ice still might not bring it back. Without it, we suffer fast climate feedbacks and further rapid warming.
We'd need to fight feed-back effects like melting permafrost and methane clathrates, which would kick and release frozen carbon over the next 200 yrs. There is as much as 4x the amount of sequestered carbon (1,200 GT) frozen in the Arctic as the total of all of mankind's fossil fuel use over the past 200 years (400GT). Yes, its that serious.
It is
far easier to stop warming now, rather than after Arctic sea ice is gone. We barely have the technolgy to deal with these affects now,
BEFORE the albedo flip lets the genie out of the bottle. Or are we awakening the Kracken?
Regrettably, today this is a political fight against vested interests who actively fight public acceptance of climate science, and have trillions of selfish reasons to protect their stranded assets.
The more obvious the effects of Arctic warming become, the harder it will be to deal with their consequences, until eventually it becomes beyond society's capacity to respond.
This is why we must fight the disinformation campaign, and why Tesla's mission must not fail. The fate of Society hangs on the outcome.