For 40 US and UK teams have been monitoring concentrations of carbon dioxide and methane on Ascension Island, but that operation is under threat
Source:
https://www.newscientist.com/article/2205544-vital-global-climate-monitoring-scheme-axed-on-remote-uk-island/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home