If you've ever braved London Underground's Northern Line tube service during rush hour, you'll have have experienced the 10th circle of hell that Dante somehow managed to forget.
Cramped, sweaty, and hot enough to make you faint, it's horrible. But all that excess heat may serve a worthy purpose yet, as it's being earmarked to warm some of London's homes.
Five hundred homes in the Islington borough of the city will be heated by the proposed scheme, siphoning off heat from the Northern Line and feeding it to the Bunhill Heat and Power Center. The power plant already uses "secondary heat sources" to warm a further 700 homes in the area, but it's the first time the Underground will have helped out.
Jointly funded by $4.4 million from Islington Council and $1.6 million from the European Union, as part of the EU's CELSIUS project (aiming to utilize European cities' waste energy), London Mayor Boris Johnson aims to supply 25 per cent of the capital's energy through these and other "decentralized" sources by 2025.