Climate change position Happer disagrees with the
scientific consensus on climate change, stating that "Some small fraction of the 1 °C warming during the past two centuries must have been due to increasing CO2, which is indeed a greenhouse gas", but argues that "most of the warming has probably been due to natural causes". Climate Science Watch published a point-by-point rebuttal to one of Happer’s articles. A petition that he coauthored to change the official position of the American Physical Society to a version that raised doubts about global warming was overwhelmingly rejected by the APS Council. Happer has no formal training as a climate scientist, In December 2015, Happer was targeted in a sting operation by the environmental activist group
Greenpeace. Posing as consultants for a Middle Eastern oil and gas company, they asked Happer to write a report touting the benefits of rising carbon emissions. Happer declined a fee for his work, calling it a "labor of love", but said that they could donate to the "objective evidence" climate-change organization
CO2 Coalition, which suggested that he contact the
Donors Trust to keep the source of the funds secret as requested by the Greenpeace sting operation. Hiding the sources of funding in this way is lawful under U.S. law. Happer further acknowledged that his report would probably not pass peer-review with a scientific journal. In an interview, Happer responded to the sting operation: "I was only interested in helping the 'client' to publicize my long-held views, not to peddle whatever message the 'client' had in mind ... I have never taken a dime for any of my activities to educate the public that more CO2 will benefit the world."
Political In 2017 following the election of
Donald Trump into office, Happer met with Trump to discuss potentially becoming the
Science Advisor to the President, and said that he would take the job if it was offered. Happer described Trump as "very attentive" and that the president's concerns "were that of a technically literate person". They discussed the president's uncle
John Trump, whom Happer had known. Hannah Devlin of
The Guardian wrote that Happer "supports a controversial crackdown on the freedom of federal agency scientists to speak out about their findings, arguing that mixed messages... have led to people disregarding all public health information." He resigned from the Council in September 2019, reportedly because his plan to review climate science did not receive sufficient support from the White House. It was shelved as some members of the administration, including
Kelvin Droegemeier, believed it could harm Trump in his 2020 re-election campaign. ==Honors==