Michigan State University plant biochemist Tom Sharkey and his team discovered that, on a warming planet, plants such as oaks and poplars will emit more of a compound that exacerbates poor air quality, contributing to problematic particulate matter and low-atmosphere ozone. The rub is that the same compound, called isoprene, can also improve the quality of clean air while making plants more resistant to stressors including insects and high temperatures. The findings were recently published in the journal Proceedings of the National Academy of Sciences.