Ever since there has been an atmosphere.
carbondioxide
Cement production releases carbon dioxide as a greenhouse gas.
Carbon is not a green house gas, but CO2 and CH4 are, and others too, but these are just two commonly known ones.
yes
Methane.
No.Hydrogen gas is not a green house gas. Hydrogen chemically combined with oxygen becomes a green house gas. Water vapor is the most common green house gas making up about 75% of all warming.
The true gas that causes it is CO2
Green House Gas
carbon dioxide
CFC or chloroflourocarbon
That is China
Carbon Dioxide.