PCBs, used to manage risks from the flammability of dielectric fluids and to increase the durability of elastic sealants, had declining environmental concentrations after legislation banning new production was passed during the 1970s and 1980s in Europe and North America.

This paper describes the follow-up interventions and results of the work place tobacco cessation study.

Its short lifespan and greater potency means tackling methane emissions now could have a dramatic effect on atmospheric greenhouse gas concentrations.

The grey, sulphur-laden skies overlying parts of Asia have a bright side — they reflect sunlight back into space, moderating temperatures on the ground. Scientists are now exploring how and where pollution from power plants could offset, for a time, the greenhouse warming of the carbon dioxide they emit.

Roger Bilham, one of the first seismologists to visit Haiti after last month

Protesters saying "no to CO2" are just one roadblock facing carbon sequestration

A study suggests that trees can act like chimneys, moving methane gas produced by soil microbes up through roots, stems and leaves before releasing it into the atmosphere. This effect could account for as much as 10% of methane emissions globally2. It could also help to explain why methane fluxes are higher than expected in wet tropical regions.

Phil Jones holds himself defensively, his arms crossed tightly in front of his chest as if shielding himself from attack.

Transparency and quality control are essential in the highly uncertain business of assessing the impact of climate change on a regional scale. (Editorial)

Water might be locally renewable, but it is also a globally finite resource with shifting availability. Industry accounts for most of the water used in the U.S., yet industry-specific estimates of that consumption