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On the heels of another halting round of talks on climate change, UN scientists this week will review quick-fix options for beating back the threat of global warming that rely on technology rather than political wrangling.

North and South Korea held talks on Tuesday about a potential volcanic threat from the peninsula's highest mountain, in a rare interlude of cooperation after months of confrontation.

A European drive to forge a legally-binding deal on climate change by 2015 that would include all major carbon polluters is "too much", a senior Chinese negotiator said at UN talks here.

Climate change could mean unthinkable loss for South Africa, which hosts talks on global warming that will bring government negotiators, scientists and lobbyists from around the world to the coastal city of Durban next week. Guy Midgley, the top climate change researcher at the South African National Biodiversity Institute, said evidence gleaned from decades of recording weather data, observing flora and fauna and conducting experiments makes it possible for scientists to "weave a tapestry of change."

The Deakin University invention uses waste heat to reduce friction by warming the engine oil. A prototype has been built and tested and the inventors are now talking to the car manufacturers and developing an aftermarket conversion kit. The system, which can be retrofitted, works by diverting waste heat to bring engine oil up to its optimal operating temperature. It was developed by researchers at Deakin University led by Mr Frank Will of the School of Engineering during his PhD project.

The US president has urged Chinese leaders to implement policies to help create a more balanced economic relationship between Washington and Beijing. Barack Obama also raised concerns about the human rights situation in China in talks with Wang Qishan, the Chinese vice-premier, and the state councillor, Dai Bingguo, at the White House in Washington on Monday. Obama and the Chinese leaders discussed ways of working together to prevent Iran from developing nuclear weapons and to persuade North Korea to abandon its nuclear weapons programmes, the White House said in a statement.

Sebastian Thrun talks about Google's amazing driverless car - and his very personal quest to save lives and reduce traffic accidents. Jawdropping video shows the DARPA Challenge-winning car motoring through city traffic with no one behind the wheel; dramatic test drive footage from TED2011 demonstrates how fast the thing can really go.

International climate negotiators were at odds Tuesday on how to raise billions of dollars to help poor countries cope with global warming. A major shipping group is willing to help, endorsing a proposal for a carbon tax on vessels carrying the world's trade.

In his talk on Deep Optimism, Ridley presented a coherent, integrated, and astoundingly thorough case for progress in all degrees. For one easy-to-visual metric, Ridley showed how it takes less time each year to work for a constant benefit, say on hour of artificial light at night. It 1800 it took six hours of typical labor to purchase an hour's worth of candles, so few working people did. In 1880 it took fifteen minutes of work to purchase an hour's worth of kerosene for a lamp. In 1950 it took eight seconds of work to pay for an hour's electricity for a light bulb. In 1997, it took only half a second -- a blink -- of work to light a compact fluorescent bulb for an hour.

Steven Pinker charts the decline of violence from Biblical times to the present, and argues that, though it may seem illogical and even obscene, given Iraq and Darfur, we are living in the most peaceful time in our species' existence.