This is a poor title because it reads as though it's the dust that is emitting longwave radiative heating ("exerts ... radiative heating") which might imply less heat trapped in the atmosphere if it has more opportunity to be radiated back out, but the abstract says: > we show that scattering and absorption of longwave radiation by dust heats the planet by +0.25 ± 0.06 W m⁻² (90% confidence) The dust is absorbing and scattering (reducing the amount of heat reflected back out of the atmosphere), not radiating.