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As London's greenest building opens its doors for business, One Planet gets an exclusive tour from the owners - a bunch of accountants (admittedly they are one of the world's biggest accountancy firms, PricewaterhouseCoopers). We consider why PwC and two of their global rivals have spent a billion dollars on new eco buildings within recent months - why are the bean counters leading the way when it comes to sustainable design.

Also in the show we head out with the waste collectors who take 45,000 litres of used cooking oil every month from London's restaurants and power the PwC building with it. Plus we speak with one of the world's leading sustainable architects, and we explore the evolution of Kuala Lumpur from it's tallest building - the Petronas Towers.

As ever, tune in, have a listen and then let us know what you think. Email the team at oneplanet@bbc.com, or join us on Facebook, the link's below. And if you tweet - we're on Twitter too.