Atmospheric methane is a greenhouse gas that has been measured directly since 1983. It has increased steadily to present day levels; this increase is highly correlated with human population growth and with related activities, including agricultural practices.
This chart represents global average methane concentration in parts per million by volume (ppmv). In 1983, the global averaged value of atmospheric methane was 1.61 ppmv. A century ago, the average was 0.9 ppmv. Atmospheric methane levels continue to rise.
