Answer: greenhousegases

AnswerCrossword Clue
GREENHOUSEGASES"An Inconvenient Truth" topic
GREENHOUSEGASESCarbon dioxide and methane
GREENHOUSEGASESGlobal-warming issues
GREENHOUSEGASESMethane and ozone
GREENHOUSEGASESCause of global warming
GREENHOUSEGASESCO2 and methane, to a ecoscientist
GREENHOUSEGASES"Hot" political topic
GREENHOUSEGASESAtmospheric worries
GREENHOUSEGASESBig topic in "An Inconvenient Truth"
GREENHOUSEGASESThey leave carbon footprints