ciência em estudo

Cities swap expertise on climate
The leaders of more than 20 world cities are meeting in London to swap ideas on combating climate change.
Berlin's investment in solar cells, Mexico City's taxi fleet upgrade, and Toronto's use of lake water cooling for its buildings are all on the agenda. London Mayor Ken Livingstone, who is hosting the event, says that cities have a special responsibility to curb emissions, and special opportunities. Cities consume about 75% of global energy production. The World Cities Leadership Climate Change Summit brings together representatives from a diverse range of cities, including Beijing, Delhi, São Paulo, Stockholm and Kingston.

US school swaps books for bytes
A school in Arizona, US, has thrown out its paper-based text books and is relying solely on laptops and digital material to teach its pupils.
Empire High School is one of a band of schools which is taking computer technology out of the classroom and into students' bags. Calvin Baker, chief superintendent of the Vail School district, told BBC World Service programme Go Digital that it has not signalled the total demise of text books. "There are no text books other than a couple on the shelf for teachers to use as resource," he explains. "We still have a library - we are not anti-books. We have a library and we encourage students to use it, but the primary delivery of instruction materials is being done through the laptops."

Yahoo backs digital library plan
Yahoo is helping create a digital library of books, video and audio to rival the one being set up by Google
BBC