By breathing, burning fossil fuels, ...
Carbondioxide (CO2)
Humans use carbon dioxide to keep their blood balanced so it is not too acidic or too bacic
because plants breathe in carbondioxide and breathe out oxygen which animals and human breathe in if there is no carbondioxide there will be no plants ,no animalsand no humans which means no life on earth.
plants. when humans exhale carbondioxide, plants take it in and turn it back into oxygen. especially trees
no it burns the oxygen and releases co2 (carbondioxide) among other pollutants
j.black
we breath carbondioxide
carbondioxide
Carbondioxide
It's CO2
CarbonDioxide =]
lime water