Research Contradicts Man-Made Global Warming Scares." Heartland did not remove any scientist's name from the list. Avery explained, "Not all of these researchers would describe themselves as global warming skeptics...but the evidence in their studies is there for all to see." The institute's then president, Joseph Bast, argued that the scientists "have no right—legally or ethically—to demand that their names be removed" from Heartland's list. International Conferences on Climate Change Heartland's conventions of climate change doubters are one of the things the institute is largely known for, according to the Los Angeles Times. Between 2008 and 2019 the institute has organized thirteen International Conferences on Climate Change, bringing together hundreds of global warming deniers. Conference speakers have included Richard Lindzen, a professor of meteorology at MIT; Roy Spencer, a research scientist and climatologist at the University of Alabama in Huntsville; S. Fred Singer, a senior fellow of the institute and who was founding dean of the School of Environmental and Planetary Sciences at the University of Miami and founding director of the National Weather Satellite Service; Harrison Schmitt, a geologist and former NASA astronaut and Apollo 17 moonwalker; Dr. John Theon, atmospheric scientist and former NASA supervisor; and Wei-Hock "Willie" Soon, a part-time employee of the Solar and Stellar Physics (SSP) Division of the Harvard-Smithsonian Center for Astrophysics. In the first conference, participants criticized the Intergovernmental Panel on Climate Change and Al Gore. In 2010 the BBC reported that the heavily politicized nature of the Heartland conferences led some "moderate" climate skeptics to avoid them. In an article in The Nation, the 6th conference was described as "the premier gathering for those dedicated to denying the overwhelming scientific consensus that human activity is warming the planet". The 7th conference (May 2012) was the main subject of the October 2012 documentary, Climate of Doubt, by Frontline, a public television series of original, in-depth documentaries. At the conclusion of the 7th conference, Joseph Bast announced that the organization might discontinue the conferences, but the eighth conference was held in Munich, Germany later the same year (30 November and 1 December 2012). The ninth conference was held during July 2014 in Las Vegas, Nevada. The 2015 tenth conference was held in Washington D.C. The 2019 thirteenth conference was held at the Trump International Hotel in Washington, D.C. "Unabomber" billboard campaign On Thursday May 3, 2012, Heartland launched an advertising campaign in the Chicago