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

Sydney, Tokyo and Buenos Aires are in for some of the biggest sea-level rises by 2100, finds one of the most comprehensive predictions to date.

As pollution levels return to normal in China's capital after a record-breaking month of smog, what can be done to banish the smog?

In a remote corner of west Texas, in the shadow of a sprawling wind farm, one of the world's largest batteries was switched on last week. Deep in oil country, the battery is at the vanguard of efforts to help renewable energy sources realise their potential and, ultimately, oust fossil fuels in the US.

An experiment by Microsoft Research aims to see how people will interact to solve a puzzle that relies on teamwork and cellphones.

Barack Obama is certainly talking the talk on climate change - promising to put the fight against global warming at the heart of his second term. What's more surprising is that the US - historically, the world's biggest emitter - actually seems to be walking the walk. It is on track to meet Obama's 2009 pledge to cut US emissions by 17 per cent, from 2005 levels, by 2020. The target could even be exceeded, which may give a boost to the long-stalled international climate talks.

The east coast of Australia has been drenched by floods and torrential rains, even as recent bush fires affecting much of the country continued to burn. Four people are known to have died as Australians get a further taste of extreme weather that is predicted to become more common as the planet warms.

An interplanetary energy crunch looms. Will NASA keep a nuclear tiger in its tank, or put the sun in its sails?

There's lots of buzz about the disappearance of honeybees, but the bumblebee is faring even worse – and some say it is the more crucial pollinator.

For many in India, when the largest blackout the world has ever seen struck last week, it didn't come as a surprise. Smaller, scheduled blackouts are a common way that the country copes with its explosive growth in demand for electricity.

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