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Crossword clues for a greenhouse gas

AnswerClue
DIOXIDECarbon ___ (greenhouse gas)
EPAFederal org. with a "personal greenhouse gas emissions calculator"
COALBig greenhouse gas culprit
OZONEGreenhouse gas
EPAOrg. concerned with greenhouse gas
WATERImportant greenhouse gas
EPAGreenhouse gas regulator: Abbr.
CARBONCOP*Enforcer of greenhouse gas restrictions?
CARBONFOOTPRINTGreenhouse-gas emission measure
MMLG-8's deadline for halving greenhouse gas emissions
OZONEA greenhouse gas
OZONETriatomic greenhouse gas
METHANEA greenhouse gas
CARBONOFFSETSGreenhouse gas mitigators
CARBONOFFSETCompensating reduction of greenhouse gas emissions
EPAGreenhouse gas regulator, for short
METHANEGreenhouse gas produced by cows
CARBONOFFSETPurported counterbalance for greenhouse-gas emissions . . . or a description of the wordplay in 18-, 27-, 39-, and 51-Across
COALGreenhouse gas culprit
EMISSIONSGreenhouse gas concerns
EPAGreenhouse Gas Reporting Program org.
KYOTOPROTOCOLInternational greenhouse gas treaty
EPAGreenhouse gas regulators of D.C.
OZONEBlue gas in the greenhouse effect