Obama at Yosemite attacks 'lip service' to natural beauty amid climate inaction

• President extols national parks on visit to Yosemite
• Obama says climate change 'no longer a threat, it's a reality'
• Biggest US coal company funded groups questioning climate change

Barack Obama warned on Saturday that climate change could ravage many of America's vaunted national parks, criticizing political opponents who "pay lip service" to areas of natural beauty while opposing efforts to reduce greenhouse gas emissions.

Related: Donald Trump would allow Keystone XL pipeline and end Paris climate deal