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 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 mid1800sMuch like the glass of a greenhouse, gases in Earth's atmosphere sustain life by trapping the sun's heat These "greenhouse gases" allow the sun's rays to pass through and warm the planet but prevent this warmth from escaping the atmosphere into space Without them, Earth would be too cold to sustain life as we know it When we talk about greenhouse gases, we're referring toGreenhouse gases trap heat in the atmosphere, which makes the Earth warmer People are adding several types of greenhouse gases to the atmosphere, and each gas's effect on climate change depends on three main factors How much? 1 Percentage of greenhouse gases in the atmosphere