My father, Brian Orr, who has died aged 88, was a scientist, a civil servant and an activist in the London Federation of Green Parties. He had predicted the impact of global climate change from his youth in the 1950s, his ongoing theme being the loss of biodiversity.
Having joined the party when it was the Ecology party in 1982, he played a crucial role in restarting Brent Green party as an effective political body in the 1990s: as party chair and election agent he ensured that candidates stood in all elections; he stood as a candidate twice himself and was treasurer for the federation when Noel Lynch was chair.
