[Comment] Offline: Climate and health-time to step up our activism

New scientific evidence indicates that global warming is accelerating, presenting an urgent challenge for planetary health and climate stability.

In a paper published in Geophysical Research Letters in March 2026, researchers Grant Foster and Stefan Rahmstorf analyzed temperature measurements to determine the current pace of planetary warming.

By stripping out the noise caused by natural variability in temperature data, the researchers concluded with over 98% confidence that the rate of global warming has speeded up since 2015.

Foster and Rahmstorf describe this acceleration as large and significant, suggesting that the planet is warming faster than previously observed in earlier periods of the current climate crisis.

The study explores the potential drivers behind this increased rate of warming. The authors speculate that the acceleration may be linked to reductions in air pollution.

Specifically, the researchers suggest that lower levels of air pollution might have diminished the presence of atmospheric cooling aerosols, which previously helped to mask some of the warming effects of greenhouse gases.

The findings highlight a critical tension in environmental health: while reducing air pollution is essential for improving immediate respiratory and cardiovascular health, the removal of certain aerosols can inadvertently accelerate the warming of the atmosphere.

The researchers provided a stark assessment regarding the future of the planetary temperature trend, emphasizing the direct link between human activity and climate outcomes.

The paper concludes that the ability to halt this acceleration rests entirely on the global capacity to eliminate carbon emissions.

Stopping this trend is in our hands: studies show that global warming will stop around the time humanity reaches zero CO2 emissions, but it can hardly be reversed.

Grant Foster and Stefan Rahmstorf

This conclusion underscores the permanence of the current warming trend, noting that while the acceleration can be stopped by reaching net-zero CO2 emissions, the resulting temperature increases are largely irreversible.