Matthew Pencharz is London’s deputy mayor for Environment and Energy. Since the Mayor’s re-election in 2012 he has led the GLA’s work on carbon emissions reduction; secure and affordable energy supplies; improving air quality; the protection, improvement and creation of green space; waste policy; water efficiency and drainage; and making London more resilient in the face of more frequent extreme weather. He was previously a political journalist with the BBC specialising in environmental and energy stories.