Chinese University postgraduate student Julian Lui Chin-kin demonstrates a 'cloud in a bottle' science experiment to pupils from MKMCF Ma Chan Duen Hey Memorial College, Tseung Kwan O, designed to help them understand the causes of global warming. The demonstration at Hong Kong's Science Museum, was one of a number carried out as part of the ZeroCarbonCity exhibition co-organised by the British Council and British Consulate-General Hong Kong. ZeroCarbon comprises a photographic exhibition, a DVD featuring 10 climate issues at 12 global locations and is part of a campaign aimed at primary and secondary pupils. The exhibition, which finishes on Wednesday, is aimed at 'stimulating greater public debate and awareness about climate change and the energy challenges facing the world's greatest cities'. For more information see: www.britishcouncil.org.hk/zerocarboncity