Climate Change Trends (as of 2019 or 2020)
Carbon Dioxide Equivalent 1979-2019 (equivalent carbon dioxide concentration taking into account other greenhouse gases, such as methane and nitrous oxide):

1979: 382 parts per million.; 2019: 500 parts per million (+118 ppm).
URL:     https://www.patreon.com/posts/climate-change-46574708