American Scientist

Climate change first 'went viral' exactly 70 years ago

Retrieved on: 
Friday, May 12, 2023

UK prime minister Margaret Thatcher warned of a giant experiment being conducted “with the system of this planet itself”.

Key Points: 
  • UK prime minister Margaret Thatcher warned of a giant experiment being conducted “with the system of this planet itself”.
  • But it was actually 35 years before that – fully 70 years ago this month – that the danger of carbon dioxide build-up in the atmosphere first travelled around the world.
  • In 1938 English steam engineer Guy Callendar suggested to the Royal Society in London that warming was under way.
  • He looked at how carbon dioxide actually functions in the real world, not just at sea level (without getting too technical.
  • Every year, as we burn more oil, coal and gas, the concentration climbs and more heat is trapped.
  • There’s a very good chance we will have gone over the 2°C warming level that used to be regarded as “safe”.