Deep within New Zealand's Nelson Lakes National Park, about a two-day hike...

CNN Climate 2 years ago

Deep within New Zealand's Nelson Lakes National Park, about a two-day hike from the nearest civilization, lies Rotomairewhenua, or Blue Lake. It was first discovered by Ngāti Apa, a Māori iwi, or tribe. It became a sacred place where they cleansed the bones of the dead, believing this would secure the spirit a safe journey to the ancestral Māori homeland of Hawaiki. Hikers have long commented on the lake's extraordinary color, but it was only around a decade ago that scientists discovered that the water of the sub-alpine lake had "exceptional optical purity" with a visibility of between 70 and 80 meters. That's in line with that of pure water, which they said made it "the most visually clear freshwater yet reported." The title of "clearest lake in the world" and photos of the stunning landscape have since been shared widely on social media, making the lake a popular tourist destination between December and March (during New Zealand's summer). But conservationists and the Ngāti Apa now fear that this increased popularity could threaten the purity of the lake. Read more at the link in @cnntravel's bio. 📸: Janet Newell; John Wotherspoon; Paul Bryant/Genesis Energy Ltd

layersDaily Sustainability Digest

Published about 9 hours ago



Climate damage and material waste are reshaping sustainable construction more forcefully than certification culture. The loss of 38 homes to wildfire in the Midlands has exposed the need for sustainable building design that treats fire resilience, flood resistance and passive survivability as core requirements. Shropshire fire crews’ warnings over escalating wildfire and flooding extremes underline a decisive shift for green construction: buildings must be designed for volatility, not historic weather patterns.

The UN’s warning that climate impacts could displace millions across South Asia raises direct implications for environmental sustainability in construction.

Large-scale migration would intensify pressure on housing delivery, infrastructure finance, sustainable urban development and supply chains for low carbon construction materials. Adaptation is now a construction pipeline issue, requiring life cycle thinking in construction, robust building lifecycle performance and a clearer link between resilience, life cycle cost and whole life carbon.

Materials innovation is moving towards the circular economy in construction. Plans for a wind turbine recycling facility at the Port of Inverness show renewable infrastructure confronting end-of-life reuse in construction. The sector’s claims on circular economy performance will increasingly depend on measurable circular construction strategies, resource efficiency in construction and sustainable material specification, not marketing language. Embodied carbon, embodied carbon in materials and the carbon footprint of construction must be assessed alongside operational energy if net zero carbon buildings and net zero whole life carbon targets are to be credible.

Research converting waste plastics, packaging and old CDs into polymer networks that harvest moisture from air points to future green building products and construction-adjacent materials for water-stressed regions. The science remains early stage, yet it supports the wider move towards low embodied carbon materials, renewable building materials where appropriate, and practical eco-design for buildings.

Laboratory findings showing duct tape outperforming sandbags as a flood defence reinforce a key lesson for sustainable architecture: resilience can come from inexpensive, rapidly deployable measures as well as major green infrastructure. The direction is clear. Sustainable construction is expanding beyond carbon accounting into whole life carbon assessment, lifecycle assessment, low carbon design, circular economy principles and climate practicality. The strongest projects will combine energy-efficient buildings, lower embodied carbon, carbon footprint reduction and durable adaptation to a harsher world.

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