What determines the contribution of a greenhouse gas to global warming? Concentrations H20 and Co2 are the two biggest contributors to the atmospheric warming because of their higher concentrations Lifetime The longer-live a gas is, the higher the contribution e g N20 contribution> CH4 Effectiveness as an infrared absorber For example, cFc-11 and CFC-12What determines the contribution of a greenhouse gas to global warming? • Concentrations – H2O and CO2 are the two biggest contributors to the atmospheric warming because of their higher concentrations. • Lifetime – The longer-live a gas is, the higher the contribution. e.g. N2O contribution > CH4 • Effectiveness as an infrared absorber – For example, CFC-11 and CFC-12