One need only to use your computer and Google William Happer to find what a distinguished career he has had and to appreciate his expertise in gas  (CO₂) spectroscopy. Then one might do a Google search for IPCC fraud, which on Jan. 8 produced about 607,000 results in 0.35 seconds, or a search for global-temperature fraud that produced about 11,600,000 results in 0.47 seconds. The articles clearly cast doubt on a consensus countering Happer’s viewpoints. In regard to CO₂ as a greenhouse gas, one might ask how and why does it act. Yes, it reacts with infrared radiation (wavelengths commonly listed as ranging from 0 to 1000uM) in three narrow fingerprint absorption points: 2.9, 4.3, and 15uM. The great bulk of infrared passes by unaffected.

NASA has pointed out that CO₂ can protect the Earth from harmful bursts of solar radiation by intercepting it in the upper atmosphere. Again, water in all of its forms (vapor, liquid, and ice) has CO₂ absorption bands that overlap that of CO₂. The concentration of water vapor is many times that of CO₂ in the atmosphere, and in the laboratory, one cannot demonstrate a significant greenhouse effect for CO₂ in the presence of water vapor. Hopefully, Trump does pay attention to Happer.