What is natural gas? What geological processes form natural gas?
Is natural gas found in equal amounts around the globe? Why or why not?
How much natural gas is used in the United States each year? How does this compare with oil and coal use?
How does burning natural gas influence the carbon cycle?
How much carbon dioxide (CO2) does natural gas emit compared with other fossil fuels?
Are there energy alternatives that emit less CO2 than natural gas does? If so, are these solutions equally available everywhere on Earth?
Based on your findings, would you consider natural gas a clean source of energy?

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