Can Australia lead the world in carbon capture technology? The influential climate scientist James Hansen hopes so. In an open letter published last week, he asked Australian prime minister Kevin Rudd not to build any new coal-fired power plants until the technology to capture and store carbon dioxide is ready.

This month, NASA begins the most extensive field campaign ever to investigate the chemistry of the Arctic's lower atmosphere. The mission is poised to help scientists identify how air pollution contributes to climate changes in the Arctic. The recent decline of sea ice is one indication the Arctic is undergoing significant environmental changes related to climate warming. NASA and its partners plan to investigate the atmosphere's role in this climate-sensitive region with the Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) field campaign.

A potential new weapon in the battle against global warming - to remove carbon from the atmosphere by locking it up permanently in soil minerals - is being developed at Newcastle University in the UK. When plants absorb carbon dioxide from the atmosphere during photosynthesis, they use some of the carbon to grow. But most is pumped through the roots into the earth around them and then escapes back into the atmosphere or groundwater.

New research has dealt a blow to the skeptics who argue that climate change is all due to cosmic rays rather than to man-made greenhouse gases. The new evidence shows no reliable connection between the cosmic ray intensity and cloud cover. Lauded and criticised for offering a possible way out of the dangers of man made climate change, UK TV Channel 4's programme "The Great Global Warming Swindle", broadcast in 2007, suggested that global warming is due to a decrease in cosmic rays over the last hundred years.

This report presents a wide-ranging review of arctic climate impact science. It spans the width of subject areas, covering impacts on physical and biological systems, as well as on humanity. The report presents the scientific evidence for arctic climate change impacts in review sections, each of which targets a particular arctic system or cross-cutting arctic theme.

Attaching a 'floating' tree-ring chronology to ice core records that cover the abrupt Younger Dryas cold interval during the last glacial termination provides a better estimate of the onset and duration of the radiocarbon anomaly. The chronology suggests that marine records may be biased by changes in the concentration of radiocarbon in the ocean, which may affect the accuracy of a popular radiocarbon calibration program during this interval.

Because of difficulties in creating a radiocarbon calibration that covers the end of the last glaciation, defining the timing and duration of the Younger Dryas cold event has been a challenge. Linking related cosmogenic isotopes in tree rings and ice cores may provide new insights into abrupt climate changes.

A new technique for deriving hurricane climatologies from global data, applied to climate models, indicates that global warming should reduce the global frequency of hurricanes, though their intensity may increase in some locations.

Tropical cyclones account for the majority of natural catastrophic losses in the developed world and, next to floods, are the leading cause of death and injury among natural disasters affecting developing countries (UNDP/BCPR 2004). It is thus
of some interest to understand how their behavior is affected by climate change, whether natural or anthropogenic.

India's first centre dedicated to monitoring climate change and finding country-specific solutions was opened at Anna University by R.K.

Next week, government negotiators will gather in Bangkok, Thailand, for the latest round of international climate change talks.