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 The relative importance of a greenhouse gas depends on its abundance in Earth's atmosphere and how much the gas can absorb specific wavelengths of energy An effective absorber of infrared radiation has a broader absorption profile, which means that it can absorb a wider spectrum of wavelengths This imbalance between greenhouse gas emissions and the ability for natural processes to absorb those emissions has resulted in a continued increase in atmospheric concentrations of greenhouse gases Concentrations of CO2 in the atmosphere have increased by about 40% since the mid1800sScientists attribute the global warming trend observed since the mid th century to the human expansion of the "greenhouse effect" 1 — warming that results when the atmosphere traps heat radiating from Earth toward space Certain gases in the atmosphere block heat from escaping Longlived gases that remain semipermanently in the atmosphere and do not respond Greenhouse Gases Climate Aware What causes gre...