With a long atmospheric lifetime of about 6 months, mercury emissions spread across the globe. (en.ilmatieteenlaitos.fi)
Certainly, CO2 and other anthropogenic GHG emissions are a potent driver of warming, with water serving in a feedback role due to its short atmospheric lifetime. (judithcurry.com)
Due to a very brief atmospheric lifetime, black carbon's climate effects are strongly regional. (c2es.org)