LONDON.- The Mayor of London Boris Johnson was at the prestigious Frieze Art Fair this morning to launch his Green Visual Arts Guide, aimed at helping artists, galleries and arts fairs to become greener and save cash. The Mayor has set a target for London to reduce emissions by 60 per cent by 2025 and the new guide gives practical information tailored specifically for the visual arts, highlighting how the sector can cut its carbon emissions and in the process save money. The Mayor, whose draft Climate Change Mitigation and Energy strategy is now available for public consultation, was joined at Frieze Art Fair by Tate Director Nicholas Serota and Matthew Slotover, Co-Director of Frieze Art Fair, which are already working to reduce their own emissions. Straightforward advice contained in the guide includes: saving energy through efficiency measures such as LED lighting and installation of insulation; using renewable energy; increasing recycling and composting and reducing the amou