As she steps down as the Green party\u2019s first, and so far only, MP, Caroline Lucas tells Madeleine Finlay what it\u2019s been like as the sole Green voice in parliament for the past 14 years, her hopes for her party in Thursday\u2019s UK general election, and what she plans to do in her life beyond politics. Help support our independent journalism at theguardian.com/sciencepod