There's a lot of recycling opportunities (bottles etc..)
The datacenters guzzle electricity because that's what computers do best. That being said, Macquarie does put in the work to make their Power Usage Effective ratios well below the industry standard (about 19% lower in the case of IC3 which does reduce the amount of co2 emissions generated by the business.
The company has numerous initiatives in place to help reduce their environmental footprint such as recycle bins, donation bins, etc.