Quiet, clean and green are not words you would typically use to describe a construction site. But the site at Olav Vs gate, one of the busiest streets in Norway's capital city, Oslo, was special. In a first of its kind in the world, all the machinery used on the site -- excavators, diggers and loaders -- were electric. Using electric equipment in place of traditional diesel engines meant that everyone in the vicinity noticed a reduction in ambient noise and pollution. Decarbonizing the construction industry is something in which Oslo wants to lead the world, and with good reason -- the construction sector is responsible for more than 10 percent of global greenhouse emissions. The city now wants all municipal construction sites to be zero-emissions by 2025 and all construction work, public or private, to be zero-emissions by 2030.

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