Long-term AGAGE measurements with global coverage are presented for four potent greenhouse gases: a fire-suppressant, a refrigerant, and two commercially-used foam blowing substances.
After almost a decade with little change in global atmospheric methane mole fraction, measurements from the AGAGE and CSIRO networks show renewed growth starting near the beginning of 2007.
Background atmospheric abundances and trends of nitrogen trifluoride (NF3), a potent anthropogenic greenhouse gas, have been measured for the first time.
Hydrogen (H2), a proposed clean energy alternative, warrants detailed investigation of its global budget and future environmental impacts.
In October 2003, thirteen major wildfires in southern California burned more than 300,000 hectares of mainly chaparral biome, strongly impacting an urban area populated by ~20 million people.
We have taken a 10-year record of observations of a gas used predominantly in hand-held foam blowing canisters and assessed the state of its trends in the atmosphere.