Huge cargo ships that criss-cross the world's oceans sometimes leave...

CNN Climate 2 years ago

Huge cargo ships that criss-cross the world's oceans sometimes leave "tracks" in their wake — long, wispy clouds that trail through the sky. These ghost clouds look beautiful, but they are a visible sign of deadly air pollution. They form when tiny sulfur dioxide particles belched out from ships' smokestacks interact with water vapor in the atmosphere, creating low-lying, highly reflective clouds. Ships' sulfur pollution causes tens of thousands of premature deaths a year. But in what may seem a cruel twist, this type of pollution also helps cool the planet by brightening clouds and reflecting the sun's energy away from the Earth. So, when the International Maritime Organization slashed sulfur content permitted in ships' fuel by 80% back in 2020, it was a victory for human health. But it was "a silver cloud with a dark lining" – the regulations ended a vast, accidental geoengineering project. Ship tracks reduced sharply, and with them, the cooling impact of this pollution. Read more about at the link in our bio. 📸: Lauren Dauphin/NASA Earth Observatory/MODIS data from LANCE/EOSDIS Rapid Response

layersDaily Sustainability Digest

Published about 8 hours ago



Regulatory momentum across the built environment is tightening as governments and industry bodies align around robust frameworks for decarbonising construction. The EU’s reform of carbon market controls aims to maintain strong carbon price signals to advance whole life carbon reduction, while ISO’s new standard on net‑zero transition plans gives investors and contractors a consistent structure for measuring life cycle cost and performance. The Science Based Targets initiative is establishing clearer boundaries between verifiable net zero carbon buildings and unsubstantiated claims, driving greater transparency in embodied carbon reporting and lifecycle assessment within construction supply chains.

Engineering progress is translating policy ambition into practice. Plans for a large‑scale direct air capture plant on Teesside highlight a new model of carbon neutral construction industry in the UK, pairing heavy engineering expertise with circular economy principles. Expansion of natural fibre insulation and low embodied carbon materials into mainstream housing retrofits demonstrates eco‑design for buildings moving beyond pilot projects. Sustainable construction now depends on accurate whole life carbon assessment and the specification of renewable building materials validated through environmental product declarations (EPDs).

Climate resilience is reshaping valuation and insurance models as climate‑driven subsidence data sharpen awareness of the environmental impact of construction. Developers are applying sustainable building design and low carbon design strategies to manage soil instability and resource efficiency in construction projects. The focus on whole life carbon and embodied carbon in materials signals a maturing market where green construction and sustainable building practices are metrics of competitiveness, not aspiration. Standards such as BREEAM v7 reinforce this shift toward lifecycle performance, end‑of‑life reuse in construction and circular construction strategies that define the next phase of environmental sustainability in construction.

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