Short-lived climate pollutant
A climate-forcing substance that remains in the atmosphere for a relatively short period compared with CO₂.
Example
Methane, black carbon and some hydrofluorocarbons are often grouped under this term.
The catch
Their chemistry, health effects and mitigation options differ.
Related terms
Methane, Anthropogenic methane, Biogenic methane, Flaring, Fossil methane, Fugitive emissions
In more depth
Short-lived climate pollutant, explained.
Short-lived climate pollutants are the fastest lever on warming over the next few decades, because the atmosphere clears them quickly once emissions fall. Black carbon stays aloft for days to weeks, methane for about 12 years and some HFCs for years to decades, so their atmospheric lifetime is measured on human timescales. CO₂ behaves differently, with part of each emission lingering for centuries.
That speed creates a real opportunity. UNEP's Global Methane Assessment (2021) found that cutting human-caused methane by 45% this decade would avoid nearly 0.3°C of warming by the 2040s. Many of the same measures improve air quality, because black carbon and ground-level ozone damage lungs and crops, which makes health a direct co-benefit. HFCs are being phased down under an amendment to the Montreal Protocol agreed in Kigali.
The category groups substances by lifetime, and it says nothing about safety. A short life does not make a pollutant harmless, since steady emissions keep its concentration high. Cuts in these pollutants also cannot replace CO₂ cuts. They lower the near-term peak, while long-term warming still depends on cumulative CO₂. Use the group name for strategy and the specific substance for any claim about results.