This ABC Science documentary explores how Australian engineers are transforming cities to be greener and more sustainable. Originally broadcast in 2020, the film takes viewers behind the scenes of some of Australia's most ambitious infrastructure and construction projects.

The documentary covers a range of innovations including the construction of Australia's largest public transport system and the massive tunnel boring machines powering the Sydney Metro project. It examines what's being called the "greenest airport in the world" and explores cutting-edge efforts to reduce CO2 emissions in concrete production.

A highlight is the exploration of Daramu House, a seven-storey timber building showcasing how engineered timber can replace traditional construction materials. Viewers witness strength testing of both green concrete and engineered timber, following the journey from tree to finished building material.

The film also delves into unexpected territory, examining super hydrophobic glass coatings that keep skyscraper windows clean and the challenges of maintaining high-rise buildings.

Through these stories, the documentary demonstrates how Australian innovation is addressing the environmental impact of urban development and construction, offering a glimpse into the future of sustainable city building.