William Happer, one of the most well-known climate optimists/realists in the world, visited The Netherlands on November 15 and 16, on the invitation of CLINTEL. Happer is a physicist, professor emeritus at Princeton University, former (climate) advisor in the Trump Administration and founder of the US thinktank the CO2 Coalition.

Happer gave a CLINTEL Lecture (full talk with Dutch subtitles) in Amsterdam in which he restated that extra CO2 is no problem for the climate and for humanity.