Official URL: https://doi.org/10.3389/frym.2024.1373791

We know Earth is warming. Clear evidence of warming can be seen in observations of the atmosphere, oceans, ice, and living things. Computer simulations can tell us what the world would have looked like without increases in greenhouse gases and other human influences, and Earth would not have warmed up like we have seen. By comparing the changes scientists have observed to computer simulations of the climate including or excluding various potential causes, scientists can work out what or who is responsible for the climate changes. Again and again, it has been shown that these simulations can only explain observed climate changes when historic emissions of greenhouse gases, principally arising from burning coal, oil, and gas, are included. The best estimate is that all the warming we have observed since 1850–1900 is due to greenhouse gas emissions produced by human activities.