In the latter part of the last century “cloud-seeding” was the favoured way to make it rain on a local catchment, likely at the expense of rainfall in some distant and unknown place. Historians have noted that, often, one of the first acts of colonial powers has been to modify the hydrologic cycle to their advantage by building channels and dams.

When we think of pollution in streams and rivers, we tend to think first of rubbish in water; the litter traps along the Yarra River in Melbourne’s CBD that are often overflowing, or the empty plastic bottles along the Moonee Ponds Creek. But water pollution takes many forms, from physical trash to invisible chemicals that accumulate in our waterways.

Victoria can simultaneously solve Melbourne’s future sewerage crisis whilst building a sustainable carbon credits sector. A common sight for Melbourne’s residents in the 1850’s would have been carts full of “nightsoil” trundling down Flemington Road. Melbourne subsequently built one of the world’s best municipal water systems, supporting the quality of life its residents enjoy today.

In 2020, Victoria still relied on coal for 69% of all electricity generation; however, the Victorian government has set a target of 40% renewable energy production by 2025 and 60% by 2030. If we harness our plentiful resources, we could be leading the charge in renewables. Led by the Gippsland Tech School, students are being challenged to design an entire city powered by renewables like hydrogen, solar, and wind energy.

“One of our research goals is to create transparent solar cells with a natural appearance so that they can be used as windows that generate solar power.” For solar window applications, a perovskite film with a thickness of no more than 600 nm is sufficient to achieve maximal light absorption. But reduced thickness also reduces potential power conversion efficiency.