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How Floating Wetlands Are Helping to Clean Up Urban Waters. As cities around the world look to rid their waterways of remaining pollution, researchers are installing artificial islands brimming with grasses and sedges. The islands’ surfaces attract wildlife, while the underwater plant roots absorb contaminants and support aquatic life. Three thousand square feet in total, these artificial wetlands are part of an effort to clean up a portion of a river that has long served the interests of industry. This floating wetland project is one of many proliferating around the world as cities increasingly look to green infrastructure to address toxic legacies. In the United States, researchers are conducting experiments in Boston and Baltimore as well as in Chicago, each team sharing best practices with the other to maximize the ecological benefits of their systems. The Canadian government and local municipalities are allotting more funding for innovative projects. Floating wetlands are also multiplying in the United Kingdom, and studies to quantify additional benefits continue in Australia and Brazil. Floating wetlands filter contaminants and take up excess agricultural nutrients that can lead to algal blooms and dead zones. Like natural wetlands, floating versions provide a range of ecosystem services. They filter sediment and contaminants from stormwater, and laboratory experiments show that some plants have the ability to lock up some chemicals and metals found in acid mine drainage. These systems take up excess agricultural nutrients that can lead to algal blooms and dead zones, and recent research suggests they could be used to reduce manmade contaminants that persist in the environment. Though it’s difficult to quantify the exact benefits these systems offer, and they have limitations as a tool in remediating polluted waterways, they could provide another option, researchers say. https://e360.yale.edu/features/floating-wetlands-cities-pollution
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Building sector emissions hit record high, but low-carbon pandemic recovery can help transform sector – UN report.....Emissions from the operation of buildings hit their highest-ever level in 2019, moving the sector further away from fulfilling its huge potential to slow climate change and contribute significantly to the goals of the Paris Agreement, according to a new report released today. However, pandemic recovery packages provide an opportunity to push deep building renovation and performance standards for newly constructed buildings, and rapidly cut emissions. The forthcoming updating of climate pledges under the Paris Agreement – known as nationally determined contributions or NDCs – also offer an opportunity to sharpen existing measures and include new commitments on the buildings and construction sector. The 2020 Global Status Report for Buildings and Construction, from the Global Alliance for Buildings and Construction (GlobalABC), found that while global building energy consumption remained steady year-on-year, energy-related CO2 emissions increased to 9.95 GtCO2 in 2019. This increase was due to a shift away from the direct use of coal, oil and traditional biomass towards electricity, which had a higher carbon content due to the high proportion of fossil fuels used in generation. When adding emissions from the building construction industry on top of operational emissions, the sector accounted for 38 per cent of total global energy-related CO2 emissions. “Rising emissions in the buildings and construction sector emphasize the urgent need for a triple strategy to aggressively reduce energy demand in the built environment, decarbonize the power sector and implement materials strategies that reduce lifecycle carbon emissions,” said Inger Andersen, Executive Director of the UN Environment Programme (UNEP). “Green recovery packages can provide the spark that will get us moving rapidly in the right direction,” she added. “Moving the buildings and construction sector onto a low-carbon pathway will slow climate change and deliver strong economic recovery benefits, so it should be a clear priority for all governments.” To get on track to net-zero carbon building stock by 2050, the International Energy Agency (IEA) estimates that direct building CO2 emissions need, by 2030, to fall by 50 per cent and indirect building sector emissions by 60 per cent. This equates to building sector emissions falling by around 6 per cent per year until 2030, close to the 7 per cent decrease in 2020 global energy sector CO2 emissions due to the pandemic. Worryingly, the GlobalABC’s new Buildings Climate Tracker – which considers measures such as incremental energy efficiency investment in buildings and the share of renewable energy in global buildings – finds that the rate of annual improvement is decreasing. It in fact halved between 2016 and 2019. To get the buildings sector on track to achieving net-zero carbon by 2050, all actors across the buildings value chain need to increase decarbonization actions and their impact by a factor of five. https://www.unep.org/news-and-stories/press-release/building-sector-emissions-hit-record-high-low-carbon-pandemic
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From RMI...Why Build Green?
This guide describes the benefits of green building and dismisses the notion that building using green methods is more expensive than traditional methods. The goal of green building is to coordinate such interconnected issues as site and building design, energy and water efficiency, resource-efficient construction, lighting and mechanical design, and building ecology, and optimize all these aspects in an integrated design. This document describes case studies of successful green buildings such as large commercial buildings, urban redevelopment projects, educational centers, and more.
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Cargo bikes deliver faster and cleaner than vans, study finds...... Home deliveries are soaring and cargo bikes cut congestion and pollution in cities, researchers say. Electric cargo bikes deliver about 60% faster than vans in city centres, according to a study. It found that bikes had a higher average speed and dropped off 10 parcels an hour, compared with six for vans. The bikes also cut carbon emissions by 90% compared with diesel vans, and by a third compared with electric vans, the report said. Air pollution, which is still at illegal levels in many urban areas, was also significantly reduced. Home deliveries have soared in recent years, spurred by online shopping and the coronavirus pandemic. Vans can travel along clear stretches of road at higher speeds than cargo bikes but are slowed by congestion and the search for parking. Cargo bikes bypass traffic jams, take shortcuts through streets closed to through traffic and ride to the customers door. Carbon emissions from transport have barely fallen in the past decade and pose a significant challenge for the UK in meeting its targets to combat the climate crisis. The government recently announced a 30% rise in funding to make cycling and walking easier. The report’s authors said the government should consider cutting the VAT rate on cargo bike deliveries and allow more powerful e-bikes to be used. “Recent estimates from Europe suggest that up to 51% of all freight journeys in cities could be replaced by cargo bikes,” said Ersilia Verlinghieri at the Active Travel Academy at the University of Westminster and lead author of the report. “So it’s remarkable to see that, if even just a portion of this shift were to happen in London, it would be accompanied by not only dramatic reduction of CO2 emissions, but also contribute to a considerable reduction of risks from air pollution and road traffic collisions, whilst ensuring an efficient, fast and reliable urban freight system.” We urgently need to put on the brakes and reevaluate how goods move through our cities. Cargo bikes are one solution that we need to get behind.” The study used GPS data from the cargo bike company Pedal Me, (read full report) which operates within a nine-mile radius of central London. The researchers compared deliveries on 100 randomly chosen days across the seasons with the routes that vans would have taken to get the parcels to customers. They found the cargo bikes saved nearly four tonnes of CO2 across the period, even when accounting for the food the riders consumed.“These benefits are not just specific to London, with the 100,000 cargo bikes introduced in Europe between 2018 and 2020 estimated to be saving, each month, the same amount of CO2 needed to fly about 24,000 people from London to New York and back,” the report said. Other research has shown that cargo bikes are more cost-effectivethan vans when delivery distances and parcel sizes are small. https://www.theguardian.com/world/2021/aug/05/cargo-bikes-deliver-faster-and-cleaner-than-vans-study-finds
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