What is the fine-grained topic of the following text: Mr Freeman said since 2017, Abbot Point Operations had implemented a number of measures to improve environmental management, including the start of a three-year program - involving an initial $15 million investment project currently underway and a total program forecasted cost up to $50 million - to facilitate continuous water infrastructure upgrades. Only return the topic.
Abbot Point Operations' environmental management improvements and water infrastructure upgrades