You hear a lot about the impacts of global warming due to the emission of greenhouse gases in the news these days, and rightly so. But there are other things that humans are adding or subtracting from the atmosphere that are changing the climate too. Here are two stories that discuss the impacts of reducing air pollution in the agriculturally important California Central Valley and the impacts of high-altitude jet flights and the gases they emit to form contrails.
Eos: Fading Air Pollution Reduced Fog in Central Valley
ClimateWire: The biggest climate threat from airplanes might surprise you
