ニューヨーク・タイムズのインスタグラム(nytimes) - 8月2日 06時56分

Construction sites in New York City used to send dirt to landfills upstate. But new research suggests that the soil is a valuable commodity — if you dig deep enough. Degraded soils are a big concern in New York, where lead contamination levels can be high. For much of the 20th century, soil excavated at construction sites was seen as toxic waste. But the demand for soil within the 5 boroughs has never been greater. As sea levels rise, NYC needs landfill to build levees that will protect neighborhoods that are susceptible to flooding during tidal surges. Soil is also needed to create new coastal wetlands to help buffer the impact of future storms. In the past, material for projects like these was trucked into the city from quarries outside its borders. But the NYC Clean Soil Bank is working to replace these expensive imports with the city’s native soils, cutting the miles it gets transported by 80% and reducing greenhouse gas emissions. TIt’s good news for builders, who will no longer need to pay to send their excavated materials out of town, and worthy environmental projects, which will receive soil and sediments for free. @vincenttullo took this photo of members of the #UrbanSoilsInstitute studying soil. Visit the link in our profile to read more.

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