CO2 and Other Greenhouse Gases

Carbon dioxide (CO₂) is the most important of many human-generated “greenhouse gases”—gases that are contributing to a gradual warming of the planet. These gases, many of which have always existed in the atmosphere, contribute to a balance of heat flows that has given us a relatively stable climate. Since the beginning of the Industrial Revolution, however, the concentration of CO₂ in the atmosphere has grown from its historical average of 280 parts per million (ppm) to over 380 ppm and counting.

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