United Press International: National parks provide recreation, wildlife habitats and natural beauty that could be lost if officials don’t act quickly to safeguard these reserves from the effects of climate change, experts told federal policymakers last week. Rising temperatures and shifting weather patterns have the potential to cause “staggering” changes to federal lands, said Rep. Raul Grijalva, D-Ariz., chairman of the Subcommittee on National Parks, Forests and Public Lands. “Science shows that …