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3. Cause of global warming

Alternative clues for the word greenhousegases

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