Oil-burning ships are fertilising the north Pacific with iron – inadvertently putting a proposed geoengineering idea into practice.

The surface of Greenland has turned to slush. Satellite data shows that a warm spell earlier this month melted nearly the entire surface of the nation's ice cap. The melt is unusual: normally about half of the ice sheet melts at the surface during summer, mostly at low elevations.

Whether Antarctica's ice will survive a warmer world is one of the great puzzles of climate science.

Methods of mopping up the oil hitting the shore from the Gulf spill must be carefully assessed to be sure they don't do more harm than good.

Methods of mopping up the oil hitting the shore from the Gulf spill must be carefully assessed to be sure they don't do more harm than good.

Efforts to keep the unique wetlands of Everglades from dying have been credit crunched, says Jeff Hecht.

Trees and shrubs grew in the Sahara between 120,000 and 45,000 years ago, suggesting wet spells may have helped early humans as they left Africa.

Atmospheric particles containing lead might have offset the Earth's warming in the 20th century.

After $10 billion spent, countless papers and a large helping of controversy, are we any closer to knowing whether Yucca Mountain in the Nevada desert offers a secure resting place for America's nuclear legacy?

AFTER $10 billion spent, countless papers and a large helping of controversy, are we any closer to knowing whether Yucca Mountain in the Nevada desert offers a secure resting place for America's nuclear legacy?