Westpac has already surpassed its emissions goal and is on target with the rubbish collection.
Reducing landfill got off to a rockier start, however, which Marsden attributed to putting too much focus on the infrastructure and not enough into educating staff about it.
"We had great recycling bins, but behaviour didn't change."
But Westpac started its four-year journey with a six-month staff education programme.
"One of the biggest mistakes us marketing people make is that we rush to tell everybody in the market what we are doing and we forget to tell our own staff."
The social goals revolve around Westpac's involvement with the rescue helicopters, the Sir Peter Blake Trust and the Halberg Trust, as well as the bank's Managing your Money programme. The goal was to deliver the programme to 45,000 people to improve financial literacy. In less than four years, more than 49,000 people have done the programme.
What has proved difficult is collecting the baseline data from which to set the targets and finding measurable ways to monitor success in less tangible areas, such as uptake of volunteer leave days.
"Starting metrics are important - collecting data is challenging, but it is also worthwhile. It helps you to share successes and galvanises the business."
Marsden said sustainability was a big concept but the important thing was to make a start somewhere.
"And once you get some action going, join the conversation out there. It's amazing what other businesses around the world are doing that you could learn from."