It is appropriate for us to contemplate the growth of understanding of chemical kinetics which has taken place since the time of Planck. Understanding starts with the recognition by Stark in 1908 of ...

Halogens are known to decrease the levels of stratospheric ozone. The latest measurements show that something similar occurs in the lower atmosphere over tropical oceans — and probably above most ...

It's been difficult to explain patterns of toxic mercury in some parts of the world, such as why there's so much of the toxin deposited into ecosystems from the air in the southeastern United States, ...