clouds – 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

aerosols clouds Cooling intervention governance implementation Engineered cooling geoengineering Marine cloud brightening natural geoengineering ship's fuels regulations

Telltale for IMO Ship’s Fuel Regulations Causing Significant: Nitrogen Oxide Emissions

Telltale for the New IMO Ship’s Fuel Regulations Causing Significant Warming Since 2023: Atmospheric Nitrogen Oxide Emissions There has been a 67% reduction in ships' cloud-altering abilities after the International Maritime Organization’s ship’s fuel regulations limiting sulfur went into effect. Sulfur is a natural component of fossil fuels…

GuestDecember 5, 2025

aerosols clouds global cooling pollutant ship's fuels regulations tropospheric aerosols

Explainer: How human-caused aerosols are ‘masking’ global warming (Carbon Brief)

First published at Carbon Brief by Zeke Hausfather on June 10, 2025 https://www.carbonbrief.org/explainer-how-human-caused-aerosols-are-masking-global-warming/ Human-caused emissions of aerosols – tiny, light‑scattering particles produced mainly by burning fossil fuels – have long acted as an invisible brake on global warming. This is largely because they absorb or reflect incoming sunlight and…

HPACAdminJune 13, 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

clouds evaporation Photomolecular effect

Photomolecular evaporation of water – How sunlight alone evaporates without heat

(Abstract) “Although water is almost transparent to visible light, we demonstrate that the air–water interface interacts strongly with visible light via what we hypothesize as the photomolecular effect. In this effect, transverse-magnetic polarized photons cleave off water clusters from the air–water interface. We use 14 different experiments to…

HPACAdminMay 10, 2024