Gas naturally present in the atmosphere, accounting for approximately 0.036% of all of the atmospheric gases, and also emitted from the burning of fossil fuels and biomass, land use changes, and other industrial processes. It is one of the main greenhouse gases and is used as a reference to the other ones.
Climate change
Climate change
Changes that are directly or indirectly attributed to human activity and alter the composition of the world's atmosphere and that is added to that caused by the natural climatic variability observed over comparable periods.