The Hon. Jonathon Porritt The Hon Jonathon Porritt is a renown environmental writer and Chair of the Sustainable Development Commission. He is a famous advocate of the Green Party and in 1996 helped to found Forum for the Future, a sustainable development charity. Jonathon Porritt is an environmental advisor to many bodies including Prince Charles and Marks and Spencer. He is chair of Sustainability South West and is also famous for his controversial views on population.