Four hundred and ten. In recent days, the fact that the concentration of carbon dioxide CO2 in the atmosphere reached a value of 410 parts per million by volume (ppmv), has been given great importance.
This concentration, as measured for many years in a station on the Mauna Loa island, Hawaii, in the middle of the Pacific, has been increasing between 2 and 3 ppmv per year.
This means that each year, about 15 to 20 billion tons of CO2 are generated, the gas mostly responsible for global warming, in addition to 3 trillion tons of CO2 already present in the 5.5 quintillion tons of atmosphere.
The carbon dioxide released into the atmosphere (about 30-35 billion tons per year) comes mainly from the combustion of fossil fuels, which is currently around 14 billion tons of oil, coal and natural gas per year.