When did global warming first get noticed by the mainstream press?
It was much earlier that you might think. In 1953 Time magazine and Popular Mechanics were running articles on the work of a physicist named Gilbert Plass.
Physicist Gilbert N. Plass had just completed some calculations on the atmospheric warming effect of carbon dioxide. He certainly wasn’t the first person to make such calculations, but he was the first to make use of computers to perform the calculations in much greater detail. He drew attention to the point that man-made CO2 emissions would have a significant warming effect on the Earth’s temperature. Popular Mechanics reported the results under the headline “Growing Blanket of Carbon Dioxide Raises Earth’s Temperature”.