Inglis' proposition was put to the test when researchers rolled out a month's worth of online ads, aimed at Republican-leaning voters and featuring prominent conservatives talking about climate risks. One spotlighted retired Air Force Gen. Ron Keys, who emphasized the number of military bases now at risk from rising sea levels driven by climate change. Inglis, in another ad, spoke about how climate solutions don't necessarily lead to bigger government. A study of those 2019 ads, published this month in the journal Nature Climate Change, found they significantly boosted belief among right-leaning U.S. voters that global warming was a serious threat - a sentiment that still borders on heresy for many conservative hardliners.