How It Works, Legal & Regulatory, News WMO says CO2 levels again at record high Atmospheric CO2 levels reached a record high in 2019 and are expected to keep rising this year despite an economic slowdown due to the pandemic. By Arete News - November 23, 2020 Heavy air pollution from brick kilns serving Bangladesh's rapid development (AN/Bryan Katz) You need to login to view this content. Please Login. Not a Member? Join Us