Seeing is believing and part of the problem is we can't see CO{2} and CH{4}, two intense greenhouse gasses. If this technique works as claimed, it may be possible to see exhaust emissions and methane leaks. Source: https://onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1002%2Flpor.202000040&file=lpor202000040-sup-0001-SuppMat.pdf Bob Wilson
