tipping – 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

carbon cycle response Carbon removal direct air capture Earth's energy imbalance Engineered cooling Engineered cooling scenarios engineered cooling strategy response geoengineering Ice Sheets Risk-Risk Analysis threshold crossing tipping

A new paradigm from the Arctic

(From Moore 2025) "The prevailing “consequences-based paradigm” defines the role of climate scientists as informing the public about the negative effects of climate change, assuming this will mobilize political action to reduce emissions. Under this paradigm, research into strategies other than decarbonization is often seen as counterproductive, an…

HPACAdminSeptember 13, 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

coral Ocean acidification Ocean response threshold crossing tipping

Ocean Acidification – Another Planetary Boundary Crossed, June 9, 2025

Coral bleaching, Great Barrier Reef Marine Park Authority, Australian Government Once a system’s degradation begins, in general it does not stop unless the thing that caused it to begin is removed. In this case, warming has caused the crossing of the ocean acidification threshold. There are situations where…

HPACAdminJune 12, 2025

1 degree C warming above normal climate restoration Ice Sheets tipping

Stokes and Deconto, May 20, 2025 – 1 C is the tipping limit of polar ice sheets

A 200-foot tall ice cliff at the Russell Glacier, Greenland Ice Sheet, Point 660, Kangerlussuaq, Greenland, Stokes and Decoto, May 20, 2025 – 1 C is the tipping limit of polar ice sheets… Abstract "Mass loss from ice sheets in Greenland and Antarctica has quadrupled since the 1990s…

HPACAdminMay 25, 2025

Amazon Boreal forest Carbon removal negative emissions tipping

Munday, May 12, 2025 – Amazon and boreal forest tipping: 1.5 C is too warm…

Summary: The only way to stop collapse of the Amazon according to this studies modeling, is to reduce the temperature from today to below 1.5 C. Then and only then will tree mortality stabilize. Temporarily overshooting 1.5 C see forest loss continue for centuries because of degradation feedbacks.…

HPACAdminMay 15, 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

carbon cycle response carbon sinks Earth systems Temperature response terrestrial response threshold crossing tipping

Land Sink Now Degrading

Duffy 2021 reports that within the last decade, the average global temperature for the warmest 3-month period passed the thermal maximum for photosynthesis. This means that on average, photosynthesis has peaked with warming and is now in decline, despite broadly accepted projections that photosynthesis would continue to…

HPACAdminNovember 16, 2023