My response to Rachael Donald's The World is in Crisis post

 Thanks Rachel Donald for your cogent analysis from a humanistic perspective. The conservation biology perspective found at http://arctic-news.blogspot.com is much more dire due to the amplified nonlinear feedbacks of methane out of the arctic (1200 gigatons of pressurized ocean shelf hydrates - accelerating into the atmosphere) and the Aerosol Masking Effect being twice as bad as previously thought. This One-Two combo predicament was dubbed the McPherson Paradox - meaning renewables just heat up the planet faster as does cleaning up sulfur emissions from burning coal and diesel.
Since the oceans have stored close to 500 zettajoules of heat already - as focused by oceanographer Jim Massa on his youtube "Science Talks with Jim Massa" - the arctic ice is melting from underneath ("heat blobs") and the ocean circulation is losing the capacity to store more CO2 emissions, thereby increasing the heat emission rate due to lack of ocean circulation. Considering atmospheric heat from anthropogenic "civilization" has been around 30 zettajoules, the 500 extra zettajoules to be emitted is scary indeed. Meaning we already ended the next ice age in the Milankovitch cycle that would kick in 50,000 years in the future.
Oil and coal are from algae and algae can sequester 100 gigatons of CO2 per year, thereby reducing the heating effect of the CO2. The "net zero" argument is that no more CO2 emissions means the oceans would keep absorbing the remaining extra atmospheric CO2 thereby cooling the planet. Sir David King has pointed out the loss of some 4 million whales from human hunting - this caused a huge loss of algae grown from whale feces. So the deep ocean circulation can sequester maybe 30 gigatons of CO2 per year if Sir David King's marine algae regeneration project kicks in. Raffael Jovine, a double Ph.D. marine biologist, created "Brilliant Planet" as near-ocean algae farms in the desert to then "mummify" (sequester) the CO2 - if this got more support he says that could sequester 10 gigatons of CO2 per year. China is also now starting to do algae carbon sequestration around coal power planets - so that the co2 emissions feed the algae. Algae is by far the best biofuel and spirulina as algae is an excellent food source also - for animal feed, fertilizer or human food directly. In fact macroalgae as red seaweed is proven to reduce methane emissions from ungulates - by over 90% and so a business in Australia now sells that product. Exxon dropped all algae investment since Exxon was trying to get algae to compete with the "barrel of oil" NROI. But in terms of ecological cost, there is no escaping the truth of algae.

So we really need to focus on regenerative algae farming to sequester enough CO2 since CO2 is the cause of the problem. I did an "algae" talk in "environmental coffeehouse" youtube channel. The future of life on Earth will be algae one way or another - and photosynthesis is the basis for quantum biology "negentropy" that drives the power of life on Earth. So photosynthesis is proven to be the highest technology on Earth as a nonlocal energy transfer from photons to electrochemical energy.
Obviously algae is not getting the focus it deserves because as an anthropocentric worldview the Western Platonic philosophy of materialistic idealism is driven by our lower emotions - and the "lack" that is produced (what Slavoj Zizek emphasizes as the jouissance from the fanatical drive of subconscious desires). So instead we get investments in fancy carbon reduction techno-fixes - be it geoengineer as "albedo modification" or some kind of power-plant system that captures CO2. These processes do not rely on the quantum negentropy of algae as the oldest life on Earth - 4.6 billion years old.
There is something even older - the tubulin proteins that evolved before even bacteria and archaea merged to create complex life. We can accesss this tubulin protein superradiance as acoustic phonon energy through meditation. This enables even communication with ghosts and spirits - and doing long distance healing also - as well as precognition. Humans figured this out in our original human culture - the San Bushmen split from the Pygmies 225,000 years ago - and the N/om energy training of the San Bushmen is the origin of what later became yoga meditation in China and India and West Asia (Pythagorean philosophy of cave meditation). For example the ayahausca trip you took was based on the tryptophan molecules inside the tubulins - the tryptophan being a benzene-like quantum dipole so that the 1/2 spin of the electron is a superluminal "extra" resonance of information-energy. This works similarly in graphene and boron nitride - so that "Dirac Cone" superluminal spin energy is a new force in physics that has been the focus of quantum engineering. But it is the secret of being alive as well.

Peter Wadhams, as Guy McPherson points out, was relying on a linear model. So at that time of the 2012 low of extent the linear trend did have a much faster "ice out" time rate aka the "Arctic Death Spiral." https://nebulousresearch.org/other/climate/ice 

"The September ice volume is plummeting towards zero - it's dropped by nearly 80% in 40 years, so at this rate there will be no summer ice by 2029." 

Guy McPherson's focus is on what happens when the ice out occurs - the ESAS methane "abrupt eruption" will occur because the methane is already accelerating into the atmosphere. This will double atmospheric temperature causing collapse of global food crops. So Guy has changed his prediction to 2030 due to some of the nonlinear feedbacks of the arctic ice. It's very difficult to predict because the 2012 low extent was due to a strong storm - and if the same kind of storm happens again then the extent could vanish very fast. The multiyear ice in the arctic is over 90% gone already. Guy cites one scientist - James Anderson at Harvard - saying there would be "no permanent ice" in the arctic by now. That is basically true - meaning no "multiyear ice." So Guy's predictions and Peter Wadhams really are only off by ten years at most. But considering this is accelerating into "biological annihilation" with only algae surviving - this is the fastest emissions of CO2 in Earth's history of life on Earth - and so 10 years error is really a good thing, not a bad thing. It has nothing to do with some political ideology although "biological annihilation" certainly leads to a radical critique of modern industrial civilization - Guy is against any deliberate "shutdown" of civilization since the Aerosol Masking Effect is twice as bad as previously thought. This is dubbed the McPherson Paradox - I just did a blog post on it.