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London

— Architecture

Renzo Piano's "skinny Shard" tower proposed for London

Renzo Piano has already made his mark on London with the Shard, but the Italian architect isn't done yet. His firm has reunited with Shard developer Sellar Property Group to propose a £1 billion (roughly US$1.54 billion) development for the UK capital. Should the mixed-use project be realized, 31 London Street will rise to a height of 65 stories and feature luxury homes, office and retail spaces, and a large public space.

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— Urban Transport

London Tube trains recover enough energy to power stations

According to Transport for London (TfL), the city's Underground carries 1.2 billion passengers a year over 402 km (250 mi) of track, with some stations handling 89 million passengers annually. That adds up to a fleet of trains covering 76.2 million km (47 million mi) and an energy bill that defines "enormous." In an effort to make the system greener and cheaper, the authority carried out a five-week trial of a regenerative braking system billed as a "world first" that could slice 5 percent off London Underground's energy bill and save up to £6 million (US$9 million) per year.

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