London mayor race: high ideals and deep denials at Green Alliance debate

Four of the leading candidates for City Hall offered a range of ideas for making London greener but also revealed some no go areas All mayoral candidates say they want a greener London, so which has the best ideas for achieving this and which is the most likely to deliver? The Green Alliance think tank held a hustings at 1 Wimpole Street with Liberal Democrat Caroline Pidgeon, Conservative Zac Goldsmith, Labour’s Sadiq Khan and the Green Party’s Sian Berry on the panel. James O&rsquo