Please could the deniers take 40 minutes of their life to watch a simple video of a scientist that has collected ice-core samples as part of his job, and his interpretation of them (peer-reviewed).....it is interesting, with pics of glaciers a hundred years ago, and today....the science, the graphs, Milankovitch cycles, the Permian mass extiction etc etc .......but the final 30 seconds is a guy standing up, with a microphone, from the audience to say "I don´t believe you".....the scientist just shakes his head and smiles.....I know who I believe!!....flat-earth society anyone?
https://www.youtube.com/watch?v=Yze1YAz_LYM