In an unassuming industrial park 30 miles outside Boston, engineers are building a futuristic machine to replicate the energy of the stars. If all goes to plan, it could be the key to producing virtually unlimited, clean electricity in the United States in about a decade.
The donut-shaped machine Commonwealth Fusion Systems is assembling to generate this energy is simultaneously the hottest and coldest place in the entire solar system, according to the scientists who are building it.
It is inside that extreme environment in the so-called tokamak that they smash atoms together in 100-million-degree plasma. The nuclear fusion reaction is surrounded by a magnetic field more than 400,000 times more powerful than the Earth's and chilled with cryogenic gases close to absolute zero.
The fusion reaction — forcing two atoms to merge — is what creates the energy of the sun. It is the exact opposite of what the world knows now as "nuclear power" — a fission reaction that splits atoms.
Nuclear fusion has far greater energy potential, with none of the safety concerns around radioactive waste.
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📸 : Sophie Park for CNN
Sustainable construction is accelerating towards measurable decarbonisation as innovation, policy, and supply chain governance begin to align. In London, bio‑based wallboards such as Adaptavate’s Breathaboard—used in Legal & General’s new headquarters—demonstrate how low embodied carbon materials with environmental product declarations (EPDs) are entering large‑scale deployment. This marks a shift from theory to delivery in eco‑friendly construction and underscores the importance of Whole Life Carbon Assessment across sustainable building design.
UK policy now links agriculture and the built environment through a £240 million expansion of the Sustainable Farming Incentive, improving soil health and cutting reliance on high‑carbon fertilisers. These measures support decarbonising the built environment and address the embodied carbon in materials central to net zero Whole Life Carbon targets. As scrutiny of the Greenhouse Gas Protocol exposes inconsistencies in corporate carbon reporting, reliable lifecycle assessment frameworks are becoming critical to verifying low carbon building outcomes and aligning procurement with sustainable material specification.
Growth in renewables, driven by projections of a fourfold expansion in offshore wind capacity by 2035, is reshaping operational emissions and strengthening the foundation for carbon neutral construction and energy‑efficient buildings designed under BREEAM V7 guidelines. This integration of renewable building materials and design principles reflects a more mature phase in the industry’s evolution towards net zero carbon buildings and a functioning Circular Economy in construction.
The sector’s trajectory points towards verified performance, where Whole Life Carbon, Life Cycle Cost, and transparent building lifecycle performance replace aspirations with measurable delivery. The transition from demonstration to large‑scale adaptation defines modern environmental sustainability in construction, confirming that the next decade will test implementation rather than intent across every level of sustainable building practices and green construction worldwide.
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