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or 55 years, Charles III has been giving speeches about the environment — from air, water and plastic pollution to the uprooting of trees, hedgerows and the draining of wetlands. For three of those decades, the veteran environmentalist Jonathon Porritt has been alongside him offering expert advice on the subject.

Porritt, who played key roles in the formation of the Green Party, led a sustainability quango set up by Tony Blair and directed Friends of the Earth, this week stepped down from the green non-profit group he founded in 1996, Forum for the Future.

One of a select cohort of environment advisers to the King, Porritt has seen Charles’s thinking on environmental issues evolve over the years he counselled him, from 1985 to 2015.

“The