As an environmentalist, he is also surprisingly upbeat about humanity in spite of the apparent mess we've made of the planet.

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As an environmentalist, and someone who believes that everyone in this world has a right to a healthy and nutritious diet of their choosing, I could not have chosen a more counter-productive path.

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As an environmentalist, his work is legendary.

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Maya Lin. (Applause.) The 2009 National Medal of Arts to Maya Lin, for her profound work as an architect, artist, and environmentalist.

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Over the years, I have defined myself in many ways: as a student, a lawyer, an environmentalist, an author, a wife, a mom, and a business woman.

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Mr Hughes is also a dedicated environmentalist and anti-nuclear campaigner, as well as being an opponent of both abortion and euthanasia.

BBC: Simon Hughes