Whole Earth Seems to be Warming Up, Courier-Mail, Friday 6 June 1947. The Arctic is Melting Says Scientist, the Argus, Saturday 31 May 1947. World’s Climate Hotter, the World’s News, Saturday 16 March 1940. World Changing Climate – Scientists Puzzled, Courier-Mail, Friday 21 April 1939. Carbon Dioxide. Could Change the World, Townsville Daily Bulletin, Tuesday 25 July 1933.
Source: Beyond Google: my afternoon trawling Trove for the first mentions of climate change
We’ve known for quite a while. It has always been popular to challenge science with ignorant opinion, and anti-science sentiment is bolstered by well funded corporate propaganda.