To control emissions, countries must first account accurately for their carbon. That will take considerable effort, reports Jeff Tollefson.

Ways to obtain more accurate data can and should be put in place to police greenhouse-gas emissions. (Editorial)

Climate change does not occur uniformly around the world: instead, in a process called polar amplification, the Arctic warms more rapidly than the tropics or mid-latitudes. Recent work published in Nature suggested that upper-atmospheric transport processes accounted for much of the recent polar amplification, but this conclusion proved controversial.

As tree habitats shift towards the poles in response to climate change, we must study the neglected, trailing edges of forests, warns Csaba M

Hydrogen fuel-cell vehicles, largely forgotten as attention turned to biofuels and batteries, are staging a comeback. Jeff Tollefson investigates.

The accumulation of nitrate in freshwater and coastal marine ecosystems is one of the consequences of the worldwide production of artificial fertilizers. Here it is shown that nitrate accumulation in ecosystems shows consistent and negative nonlinear correlations with organic carbon availability, along a continuum from soils, through freshwater systems and coastal margins, to the open ocean.

Current national emissions targets can

After years of wrangling over the chemical

A conduit from the Red Sea could restore the disappearing Dead Sea and slake the region

It had been thought that ocean temperatures during the early Archaean (around 3.5 billion years ago) were between 55 and 85