As early as the 1820s a lot of scientists were finding out about climate change. Joseph Fourier believed that light from the sun can enter the atmosphere, but cannot leave nearly as easily. He tried to prove that air can absorb the infrared radiation and will be given back to the Earth’s surface. Later in 1859, John Tyndall discovered that water vapor and CO trap heat waves given by the sun. In 1896, Svante Arrhenius tried to prove that it would take thousands of years for the industrial production of CO to raise the Earth’s temperature 5-6°C. But throughout the early 20th century many people did not believe this idea because it was too simple. In the mid 20th century, scientists worked out that there was a 10% increase in carbon dioxide in the atmosphere over the 19th century, which made it a little bit warmer. It was at this time that people believed the emissions of CO would increase exponentially in the future and the oceans would absorb any surplus of greenhouse gases. In 1956, Gilbert N. Plass decided that greenhouse gas emissions will have an effect on the Earth’s temperature and argued that not thinking about GHG emissions would be a mistake. Soon after, scientists studying all different kinds of science began to work together to figure out the mystery of GHG emissions and their effects. As technology advanced, it was in the 1980s that there was proof of a rise in CO levels. An ice core, captured through drilling, provided clear evidence that carbon dioxide levels have risen.