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Quantum Computing for Environmental Protection: Opportunities, Risks and Responsible AI

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T he environmental challenges of the twenty-first century are interconnected, nonlinear and increasingly difficult to manage. Climate change alters hydrological cycles and ecosystem distributions; industrial pollution affects human health and ecological integrity; energy transitions create new material demands; and biodiversity loss interacts with land-use change, food production and climate pressures. Addressing these problems requires reliable observations, predictive models, scientific experimentation, effective governance and technologies that can deliver measurable environmental improvements. Conventional high-performance computing, numerical simulation, remote sensing, statistical modelling and artificial intelligence already make substantial contributions to environmental science. Nevertheless, some problems remain computationally demanding. These include modelling complex molecular interactions, identifying promising materials, exploring large optimisation spaces and representi...

The Roadside Soil as a Chemical Archive of Urban Traffic

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A roadside strip of soil can appear unremarkable: compacted earth, a few weeds, dust, litter and the occasional puddle. Yet this narrow boundary between a road and the surrounding landscape receives a continuous mixture of materials generated by modern transport. Fragments of tyres, brake-wear particles, road-surface debris, trace metals, fuel-related residues and chemicals released from vehicle components can accumulate there over years or decades. Unlike an exhaust plume, which disperses through the atmosphere, many traffic-related contaminants can remain associated with soil particles. Some bind to organic matter or mineral surfaces; others move with runoff, infiltrate deeper layers or are carried into drains, rivers and agricultural land. Their concentrations and chemical forms change as the environment weathers, oxidises, dilutes or redistributes them. This makes roadside soil more than a pollution sink. Under suitable conditions, it can function as a chemical archive of urban tr...

The Hidden Environmental Life of Polyacrylamide: When Wastewater Treatment Creates New Questions

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M odern wastewater treatment depends on an array of chemicals that make pollution easier to control. Among them is polyacrylamide (PAM), a synthetic polymer used to help suspended particles aggregate, settle, and separate from water. Its effectiveness has made it valuable in municipal wastewater treatment, industrial effluent management, sludge dewatering, mining, and several other industries. PAM works through a deceptively simple principle. Its long molecular chains interact with suspended particles, linking them into larger aggregates called flocs. These aggregates can then be removed through sedimentation, flotation, or filtration. When appropriately selected and dosed, PAM can improve solids separation, reduce the burden on downstream treatment processes, and help produce a clearer effluent. Yet this apparent success raises a less frequently discussed environmental question: when PAM helps remove pollution from water, what happens to the polymer itself? The answer is not always st...