g4-en18 Greenhouse gas (GHG) emissions intensity 21 p. 27 g4-en19 Reduction of greenhouse gas (GHG) emissions 42 p. 26 g4-en21 nox, Sox, and other significant air emissions 2 p. 58 effluents and waste g4-dma Disclosures on Management approach 1, 2 p. 24 g4-en22 total water discharge 2 p. 24 g4-en23 total weight of waste by type and disposal method 2 p. 25 g4-en24 total number and volume of significant spills 1 p. 25 g4-en25 Weight of transported, imported, exported, or treated waste deemed hazardous 2 p. 25 g4-mm3 total amounts of overburden, rock, tailings, and sludges 2 p. 25 environmental compliance g4-dma Disclosures on Management approach 1 p.