natural feedback emissions – Healthy Planet Action Coalition

1 degree C warming above normal 30 degrees north and south 350 ppm CO2 aerosols albedo Arctic refreezing atmospheric greenhouse gas concentration carbon burden carbon cycle response Carbon removal climate restoration climate triad clouds Cooling intervention governance implementation direct air capture Earth systems Earth's energy imbalance Engineered cooling Engineered cooling scenarios engineered cooling strategy response geoengineering Marine cloud brightening natural feedback emissions natural geoengineering negative emissions Ocean acidification Ocean response presentation Risk-Risk Analysis sequestration ship's fuels regulations solar radiation modification SRM stratospheric aerosols Temperature response threshold crossing tipping tropospheric aerosols warming in the pipeline

Global Heating Emergency Conference by HPAC, October 15 and 16, 2025

https://youtu.be/OTlZ4lQ5Evc?si=jUFm4ufvhsmL6knr Global Heating Emergency Conference by HPAC, October 15 and 16, 2025 Global Online Conference • October 15 – 16, 2025 (https://www.preventing2degrees.org) Description: In Paris in 2015, 195 countries committed to stopping global warming. But greenhouse gas emissions have continued to relentlessly increase. The latest science shows…

HPACAdminDecember 5, 2025

atmospheric greenhouse gas concentration carbon balance carbon cycle response carbon sinks climate restoration Earth systems evaporation Ice Sheets natural feedback emissions Ocean response Precipitation response sequestration terrestrial response threshold crossing tipping

Antarctic tipping warning, mega drying – now greatest sea level rise contributor, total Earth systems sequestration flips into decline

Antarctic tipping warning, mega drying – now greatest sea level rise contributor, total Earth systems sequestration flips into decline Bruce Melton PE ClimateDiscovery.org Evidence continues to mount that Earth systems processes have passed tipping points or their tipping is foregone without rapid restoration of our climate to within…

HPACAdminAugust 24, 2025

Boreal forest carbon sinks Earth systems Ice Sheets natural feedback emissions Ocean acidification Ocean response sequestration Temperature response terrestrial response threshold crossing tipping

Sudden Jump In Published Findings on Tipping Activation

Bruce Melton PE, Climate Change Now Initiative Science is slow. It has been slower than climate change for decades and as that science has warned, if we did not act promptly and appropriately, the speed of climate change would increase further and dangerously. We now find this future…

HPACAdminJuly 3, 2025

1 degree C warming above normal 350 ppm CO2 Carbon removal climate restoration clouds Earth's energy imbalance Engineered cooling natural feedback emissions negative emissions ship's fuels regulations solar radiation modification SRM stratospheric aerosols tipping

Hansen et al., Global Warming Has Accelerated: Are the United Nations and the Public Well-Informed? Review by Bruce Melton PE

Hansen 2025 - review by Bruce Melton, Climate Change Now Initiative Summary - Hansen's 350 ppm CO2 and 1 degree C warming target is on full display where he repeatedly asserts that acceleration of warming and effects now implies that engineered cooling solutions are required to avoid untenable…

HPACAdminFebruary 20, 2025

atmospheric greenhouse gas concentration carbon burden carbon cycle response natural feedback emissions

Carbon-cycle feedback emissions reduced with reduced warming, Hausfather and Betts 2024

Hausfather and Betts show natural feedback emissions with SSP 8.5 can be up to nearly 700 ppm CO2 or about 5,000 Gt CO2, but generally between 100 and 350 ppm CO2 or 780 to 2,700 Gt CO2. See figure, “Change in CO2 concentration when including carbon-cycle feedback uncertainties.”…

HPACAdminSeptember 12, 2023

atmospheric greenhouse gas concentration carbon burden carbon cycle response engineered cooling strategy response natural feedback emissions Ocean acidification Ocean response terrestrial response

Geoengineering Reduces Cumulative CO2 – Keith 2017

Summary - "If solar geoengineering were used to hold radiative forcing constant under RCP8.5, the carbon burden may be reduced by ~100 GTC, equivalent to 12–26% of twenty-first-century emissions at a cost of under US$0.5 per tCO." It is also important to note that all other warming related responses…

HPACAdminMarch 10, 2023