3D volumetric visualisation of global atmospheric methane (CH4) emission and transport on 29th November 2018. Concentrations of 1800 parts per billion (ppb) are yellow, rising to 1900 ppb (orange), 2000 ppb and 21000 ppb (dark red). Methane is a powerful greenhouse gas. It is produced by modern agricultural practices, activities related to oil, gas, and coal extraction, and the decomposition of organic matter. The height of Earth's atmosphere and topography have been vertically exaggerated and appear approximately 50-times higher than normal in order to show the complexity of the atmospheric flow. For a version with a key see c049/2623.