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3. Carbon dioxide and methane

Alternative clues for the word greenhousegases

• Global-warming issues
• Cause of global warming
• Big topic in "An Inconvenient Truth"
• CO2 and methane, to a ecoscientist
• "An Inconvenient Truth" topic
• Atmospheric worries
• Sees enough and rages about cause of climate change?
• "Hot" political topic
• They leave carbon footprints