🏙Cities are key in combatting the climate crisis. Almost 5 billion people...

UN Climate Change 2 years ago

🏙Cities are key in combatting the climate crisis. Almost 5 billion people live in towns or cities. Generating 70% of global CO2 emissions, they can be powerful agents of change. "Portraits of Urban Change" is a photo contest by @UNUEHS and @unclimatechange showing projects that help make our cities more sustainable, inclusive and resilient. Here are three of the 20 pictures selected to be exhibited at the upcoming #COP29 climate conference in Azerbaijan in November: 🗑️The production, use and waste management of plastics generates about 4% of global greenhouse gas emissions. Mr and Mrs Ebun in Nigeria have made it their livelihood to collect plastic bags and bottles, wash them clean, weigh them and take them to recycling plants for a token. Photo: Samuel Okechukwu ⚡️ Cities use 75% of the world’s energy and produce 70% of greenhouse gases. In an effort to switch to renewable energy sources, a major corporation in Cebu in the Philippines has converted their primary power source to clean energy and placed several hectares of solar panels on residential houses. Photo: Mark Linel Padecio 🌱 Urban areas can be up to 10°C hotter than surrounding regions. City forests or gardens can significantly reduce air temperatures - and contribute to food security at the same time. An NGO in Brazil covered its roof with a vegetable garden that produces organic food and serves 400 families from the neighboring community. Photo: Hans von Manteuffel Every action counts! #UrbanOctober

layersDaily Sustainability Digest

Published about 7 hours ago



The ÂŁ41m funding boost for a Thames heat pipeline marks a significant shift in sustainable construction, moving decarbonising the built environment from policy ambition to practical green infrastructure. Capturing surplus industrial heat for up to 650,000 London homes strengthens the case for energy-efficient buildings, low carbon design and sustainable urban development at district scale. Rising household energy bills make heat networks an economic necessity as much as a net zero carbon priority.

A UN-backed taskforce has proposed measures to attract more capital into climate adaptation and resilience, reinforcing the need to treat environmental sustainability in construction as an investment issue rather than a compliance cost. Heat stress, drought, flooding and grid pressure now affect insurance, asset values, planning risk and construction programmes. Developers and lenders are being pushed towards whole life carbon, life cycle cost and building lifecycle performance as core measures of long-term value.

Materials remain a critical weakness. UK trials on bio-based, biodegradable and compostable products show that innovation in green building materials, renewable building materials and low carbon construction materials must be matched by recycling systems capable of processing them. The findings strengthen the case for lifecycle assessment, sustainable material specification, environmental product declarations (EPDs), resource efficiency in construction and clear end-of-life reuse in construction. Without stronger circular economy infrastructure, embodied carbon in materials and the wider carbon footprint of construction will remain difficult to reduce.

Industrialised construction faces the same systems challenge. Factories, standards, logistics, procurement and dependable demand must mature together if modern methods are to support low-impact construction, eco-friendly construction and carbon neutral construction at scale. Circular economy in construction depends on circular construction strategies, not isolated green building products.

The direction for sustainable building design is clear: net zero carbon buildings require whole life carbon assessment, net zero whole life carbon targets and credible evidence on embodied carbon. BREEAM, BREEAM v7, eco-design for buildings and sustainable architecture are becoming more important as clients seek measurable carbon footprint reduction across design, construction, operation and reuse. Sustainable design is no longer defined by individual products, but by integrated networks that reduce the environmental impact of construction across the full building lifecycle.

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