The image presents the forcings and solutions with beautiful simplicity. However, some of its forecasts and methods could do with some modification. For instance, whilst at a considerable stretch we might just possibly manage to reduce our own methane emissions, those of both methane and CO2 from warming permafrost and hydrates (and tropospheric H2O from lagged warming effects) are likely to grow exponentially from current levels for at least a few decades - more if we do not manage to refreeze most of the Arctic (excepting shipping lanes) by 2040. Furthermore, I do not see represented the increasing loss of albedo from sea ice loss in both polar regions and those at the third pole, nor the contribution to increasing thermal radiation management's (TRM) negative forcing that might be made by a variety of methods - particularly those that increase evaporation or transpiration.
Regarding the proposed solutions, I do not see permission being given to SAI regional deployment when other, less risky methods, are available in the forms of MCB, ISA, Seatomisers, Ice Shields, Biochar, and Buoyant Flakes. By my back-of-envelope calculations, the entirety of the SAI contribution, and more, could be provided using Buoyant Flake Ocean Fertilisation to increase the albedo of the dark blue high seas (0.06) to a slightly lighter turquoise shade of (0.12) - green grass being 0.25. Might the modellers amongst our communities please model this effect to confirm or reject the hypothesis. Sev > On 14 Mar 2023, at 2:36 pm, [email protected] wrote: > > Stabilising the climate requires equality of positive and negative radiative > forcing to achieve net zero heating. > > Here is a simple model of how climate stability could be achieved over coming > decades and centuries using albedo enhancement and greenhouse gas removal. > > Stratospheric Aerosol Injection, Marine Cloud Brightening and other cooling > methods can balance CO2 and CH4 and other warming factors. > > The left half of the diagram is from An Imperative To Monitor Earth’s Energy > Imbalance, published in 2016 in Nature Climate Change. > > The right half extrapolates radiative forcing to achieve and sustain net zero > heating from 2060. The bands are roughly drawn. > > It is possible that the main cooling work shown as SAI could be partly > replaced by other methods. > > Regards > > Robert Tulip > > <image001.png> > > -- > You received this message because you are subscribed to the Google Groups > "Carbon Dioxide Removal" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/CarbonDioxideRemoval/09aa01d95626%243c8cb2a0%24b5a617e0%24%40rtulip.net > > <https://groups.google.com/d/msgid/CarbonDioxideRemoval/09aa01d95626%243c8cb2a0%24b5a617e0%24%40rtulip.net?utm_medium=email&utm_source=footer>. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/978A6CA0-FD12-4857-B0A5-FAB8B0421780%40me.com.
