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'Brien of LBC Radio chaired. Candidates' hopes, dreams, bold assertions and no go areas regarding some of the main themes are compared and contrasted below.