Question: has the amount of carbon dioxide increased?
Answer: According to the State of the Climate in 2018 report from NOAA and the American Meteorological Society, global atmospheric carbon dioxide was 407.4 ± 0.1 ppm in 2018, a new record high. That is an increase of 2.5 ± 0.1 ppm from 2017, similar to the increase of 2.2 ± 0.1 ppm between 2016 and 2017.