Illustration by Anthony Gerace Zack Polanski is standing in the drizzle on a patch of woodland, on the edge of a car park in the quiet village of Forest Row, East Sussex, waiting to be introduced. “I thought there would be about 20 people,” Rachel Millward, the deputy leader of the Green Party, shouts excitedly to the crowd of hundreds that has gathered, on a weekday morning, with less than 24 hours’ notice, to see the Green Party leader. These are people of all ages, dressed in colourful clothes, excited. “I see people who do yoga together,” Millward declares. “Who sing together! Who dance together!” As co-deputy leader of the Greens, she says, it is her duty to “speak the truth – my truth – and to speak hope”. The crowd looks emotional. Polanski steps up, picking up the theme. “The thing that people say to me over and over again – it would become repetitive if it wasn’t beautiful – is I’m feeling hope!” The crowd erupts in agreement.…