Fuel Cells is a new briefing in the Renewables part of our Sustainability coverage. We look at what fuel cells are; emissions; setting up fuel supply infrastructure; and a range of emerging applications. It is early days for this still relatively expensive technology for generating electricity, but trials are under way and significant sales are forecast. See www. ajplus.co. uk/sustainability. This coverage of fuel cells adds to our existing briefings on renewables, which are on biomass, ground-source heating and cooling (both heat pumpbased and labyrinths), wind, solar electric (photovoltaic) and solar thermal.