Environmentalists and former agency employees warn of increased workloads for park employees at a time when park staffing is already low.By Jake BolsterU.S. citizenship will determine how expensive it is to access America’s national parks beginning next year, the Interior Department announced yesterday. Prices for non-U.S. residents to purchase an “America the Beautiful” pass, which grants the holder access to all of the country’s national parks for a year, will more than triple, rising from $80 to $250.

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