Overview
- The Nature Climate Change paper released Wednesday estimates added warming of about 0.039 watts per square meter worldwide from micro- and nanoplastics in the air.
- Lab measurements show color and size control the effect, with darker and smaller particles soaking up far more sunlight than white or larger ones.
- Modeling points to strong regional hotspots, including roughly 1.34 watts per square meter over parts of the North Pacific where the signal can exceed black carbon.
- Observations indicate the particles travel long distances on air currents, reach high altitudes, and even settle on remote glaciers.
- Experts caution the numbers carry large uncertainty due to sparse and inconsistent air measurements and say cutting plastic emissions could shrink this warming more quickly than cuts to long‑lived gases.