Engineer-amateur meteorologist discovered climate change back in 1938
In 1938, a British engineer and amateur meteorologist made a discovery that set off a fierce debate about climate change.
Scientists had known for decades that carbon dioxide could trap heat and warm the planet. But Guy Callendar was the first to connect human activities to global warming.
He showed that land temperatures had increased over the previous half-century, and he theorized that people were unwittingly raising Earth’s temperature by burning fossil fuels in furnaces, factories and even his beloved motorcycles.