Cate Blanchett, ever the environmental crusader, unveiled one of the world's largest rainwater harvesting systems in Sydney, Australia, earlier this week. 

Half the size of a football field, the installation is located on the roof of The Wharf, a massive building that is home to the Sydney Theatre Company and a number of other arts organizations. It is expected to save 3 million gallons of water each year and fulfill 100 percent of the non-potable water needs for all tenants. 

”[This] is a great example of how science and the arts are intimately connected. Both sectors are purveyors of experimentation and the embodiment of the imagination,” she said. "We’re all pleased to bring this innovative engineering technology into our creative lives today and indeed to be a showcase of how such systems can function to great economic and societal benefit."

“So, have a shower or use the loos,” she quipped.

The rainwater system is but the latest sustainable addition to a theater company already recognized as one of the greenest in the world. Last year, Blanchett and her husband, Andrew Upton, who serve as the company's artistic directors, celebrated the installation of Australia's second-largest photovoltaic rooftop array. The $5.2 million project, featuring more than 1,900 solar panels, is expected to provide 70 percent of the building's energy needs. 

"The entire project has been made possible through a unique collaboration with private philanthropists, corporate and government support, both state and federal, who really understand the incredible opportunity that greening this amazing arts precinct represents not only for the organisations down here but for the city of Sydney and the state," Blanchett said.

Expect more green projects in the years to come. The actress and her husband have said that they will remain in their current positions with the Sydney Theater Company through 2013. 

Michael d'Estries ( @michaeldestries ) covers science, technology, art, and the beautiful, unusual corners of our incredible world.

Blanchett unveils rainwater harvesting system
Actress says new installation will save 3 million gallons of water annually.