CO2 levels to be 50% higher than pre-industrial era in 2021: Report

Human activity will push concentrations of carbon dioxide in the atmosphere to levels 50% higher than before the Industrial Revolution, in 2021, the UK's Met Office reported. CO2 concentration is expected to exceed 417 ppm for several weeks from April to June for the first time. However, CO2 accumulation is expected to be slightly slower than usual in 2021.