Although a small portion of the total atmospheric pool, _____ are the most important source of increasing greenhouse gases.

Question

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Burning fossil fuels, such as coal, oil, and natural gas, releases large amounts of carbon dioxide (CO2) into the atmosphere. This is the main source of increasing greenhouse gases and contributing to climate change. While volcanoes and deforestation also release carbon dioxide, they do not contribute as significantly as burning fossil fuels. Land use change, such as converting forests to agricultural fields, can also release carbon stored in the vegetation and soil, but again, it is not as large of a contributor as burning fossil fuels.

Although a Small Portion of the Total Atmospheric Pool, _____