“As scientists, we understand the dangers of nuclear weapons and their devastating effects, and we are learning how human activities and technologies are affecting climate systems in ways that may forever change life on Earth. As citizens of the world, we have a duty to alert the public to the unnecessary risks that we live with every day, and to the perils we foresee if governments and societies do not take action now to render nuclear weapons obsolete and to prevent further climate change… There’s a realization that we are changing our climate for the worse. That would have catastrophic effects. Although the threat is not as dire as that of nuclear weapons right now, in the long term we are looking at a serious threat.”
At a press conference for the Bulletin of the Atomic Scientists, as the Doomsday Clock is moved forward by two minutes to five minutes to midnight, as quoted in "Nukes, climate push 'Doomsday Clock' forward" MSNBC http://www.msnbc.msn.com/id/16670686/ (1 January 2007)
Help us to complete the source, original and additional information
Stephen Hawking 122
British theoretical physicist, cosmologist, and author 1942–2018Related quotes
p 29 of Towards the Nuclear Holocaust (1980) Menard Press, London.

Quoted in Jonathan Kauffman, Meet the Innovator Behind the Plant-Based Meat Movement https://www.eatingwell.com/article/7905892/bruce-friedrich-plant-based-meat/, Eating Well Magazine, 2021

Stephen Shen (2013) cited in " No nuclear power, more carbon: minister http://www.taipeitimes.com/News/taiwan/archives/2013/03/21/2003557614" on Taipei Times, 21 March 2013

Jeremy Corbyn row after 'I'd not fire nuclear weapons' comment https://www.bbc.co.uk/news/uk-politics-34399565, BBC News, 30 September 2015
2010s, 2015

1950s, The Russell-Einstein Manifesto (1955)

Speech http://hansard.millbanksystems.com/commons/1991/nov/01/foreign-affairs-and-defence in the House of Commons (1 November 1991).
1990s