US environmental regulators extend comment period on climate rules for cars

The US environmental regulators are giving the public more time to comment on proposed rules for vehicle emissions and the legal basis for regulating greenhouse gases. This means the final decision on these rules will be delayed.

The US environmental regulators are considering whether to reverse a 2009 finding that greenhouse gases endanger public health. This finding is the legal basis for many climate regulations, including vehicle emissions standards. Extending the comment period pushes back any final decision, which could either solidify or weaken the government's ability to regulate climate pollution.