Microplastics climate coverage needs a scale bar. Thursday's piece said the Fudan-Duke finding moved airborne plastic into the short-lived-forcer conversation. That is not the same as making plastic the master cause of warming.

The useful number is 16.2 percent of black-carbon forcing. [1] Black carbon matters because it absorbs sunlight and warms air quickly. A fraction of that forcing from airborne plastic is worth measuring, modelling and possibly classifying. It is not larger than carbon dioxide. It is not larger than methane. It is not a substitute for the fossil-fuel inventory.

Scientific American's account explains why the result surprised the field: coloured particles absorb more light than earlier assumptions about white, scattering particles allowed. [2] The UK Science Media Centre's expert reactions supply the needed brake, noting sparse measurements and the need for more observations before policy claims outrun data. [3]

Scale literacy is not minimization. It is how a real finding survives public circulation. The climate question is whether airborne microplastics become an assessed forcing term, not whether every plastic fragment now explains the climate system.

The finding deserves a place on the chart, not the whole chart, and that distinction is what honest science communication protects.

-- KENJI NAKAMURA, Tokyo