What the heck is an eco nightclub? Picture a business that rewards customers by waiving the cover charge for proving that they walked or rode their bike there. Picture an establishment that requires patrons to sign a pledge to help fight global warming. Picture a dance floor that captures the energy of the movers and shakers above and then uses that energy to supply 60% of all the electricity needed to power the place. Picture all that and you know what an eco nightclub is. This is real place called Club4Climate in London.