He has written for the New Statesman, The Ecologist, Granta and Geographical magazines, and The Guardian and The Observer newspapers in the UK, as well as The New York Times and The Washington Post in the United States; he also worked on and appeared in the film The Age of Stupid.

[citation needed] He has co-authored a number of peer-reviewed scientific publications, including a 2021 paper which found that the consensus on anthropogenic climate change in the scholarly literature now exceeds 99%.

For example, he suggested that opposition by environmentalists, such as himself, to the development of nuclear energy had speeded up climate change, and that GM crops were necessary to feed the world.

This latter position was attacked as patronising and naive by some developing world commentators, including one featured in a Channel Four debate after the programme aired.

Lynas argues that as Earth has entered the Anthropocene, and as such humanity is changing the planet's climate, its bio-geochemical cycles, the chemistry of the oceans and the colour of the sky, as well as reducing the number of species.

In September 2012, Lynas wrote a follow-up article in The Guardian entitled "Without Nuclear, the Battle Against Global Warming Is as Good as Lost".

In a January 2013 lecture to the Oxford Farming Conference, Lynas detailed his conversion from an organizer of the anti-GMO food movement in Europe to becoming a supporter of the technology.

Soil Association, for ignoring scientific facts about genetically modified crop safety and benefits because it conflicted with their ideologies and stated that he "was completely wrong to oppose GMOs".

Ruth DeFries, Erle Ellis, Christopher Foreman, David Keith, Martin Lewis, Ted Nordhaus, Roger A. Pielke, Jr., Rachel Pritzker, Joyashree Roy, Mark Sagoff, Michael Shellenberger, Robert Stone, and Peter Teague[21] In 2017, Lynas appeared at the 17th European Skeptics Congress (ESC) in Old Town Wrocław, Poland.