Bryony Worthington

Bryony Worthington, is a British environmental campaigner and Labour life peer in the House of Lords. Worthington was once a Friends of the Earth campaigner, and “passionately opposed to nuclear power”, but came to advocate the adoption of Thorium as a nuclear fuel, after she’d learned from Kirk Sorensen about the concept of the liquid fluoride thorium reactor.

Here’s her Wikipedia page.

Here’s a june 2015 article in The Ecologist, in which she reaffirms her environmental concern and in which she strongly urges her fellow environmentalist to reconsider their opposition to nuclear power:
“Nuclear power is the most concentrated source of power available today with the smallest footprint … I urge you on moral, ethical, scientific and environmental grounds to rethink your opposition to it.”