Direct and Indirect greenhouse gas (GHG) emissions (Tonnes CO2)
| Direct CO2 emissions (Tonnes) | Indirect CO2 emissions (Tonnes) | Total CO2 | |
| 2016 | 293,873 | 200,928 | 494,801 |
| 2015 | 351,662 | 287,714 | 639,376 |
| 2014 | 334,894 | 284,094 | 618,988 |
| 2013 | 369,982 | 286,336 | 656,318 |
| 2012 | 408,072 | 272,530 | 680,602 |