Pett is perhaps best known for his cartoon featuring an attendee at a climate summit asking "What if it's a big hoax and we create a better world for nothing?," which first appeared in "USA Today" in December of 2009 before the 2009 United Nations Climate Change Conference. Shortly after the conference was over, Pett got a request for a signed copy from former EPA administrator Lisa P. Jackson. Pett has repeatedly gotten requests from over 40 environmental groups, in the United States, Canada and Europe to use the cartoon in campaigns. The Australian Greens used it in a campaign which resulted in the Australian parliament adopting the most rigorous carbon tax regime of any country in the world.