US cities losing 36 million trees a year, researchers find

Scientists warn of environmental threats rising from trend that is 'likely to continue unless policies are altered'Cities in the United States are increasingly seeing concrete in place of greenery as urban areas lose an estimated 36m trees annually, according to a study from the Forest Service.Tree cover in urban areas has declined at a rate of around 175,000 acres per year, while impervious cover - such as roads and buildings - has increased significantly across the country. An estimated 40% of new impervious surfaces were in areas where trees used to grow, the study found. Continue reading...