The plea for harmonization between EPA's and NHTSA's program isn't about aligning different regulations. It's about weakening fuel economy standards.

CAFE and greenhouse gas emission standards have been critical tools to improve fuel economy and reduce carbon pollution.

Nevertheless, the standards face resistance.

Do automakers, Dr. Cooke, really need such a substantial expansion of credits to meet the fuel economy standards?

So do you buy the estimate that this would raise the cost of a car $3,000? Does that take into account what the lower gas price would be?

Unfortunately, in my view, the United States is no longer part of that.

Calls for harmonization between CAFE and greenhouse gas standards are just further efforts to weaken the standards.

If automakers were to get all the retroactive credits they're asking for, what would this mean for real improvements in fuel economy, going forward?

The EPA found that meeting the standards is not only technologically feasible but also cheaper than expected.

Leo Rosten, the author of ``Joys of Yiddish,'' defines chutzpah as ``that quality enshrined in a man who, having killed his mother and father, throws himself on the mercy of the court because he is an orphan.'' Here is a new definition…

The transportation sector accounts for a third of the total greenhouse gas emissions in the United States.

The EPA found that to meet the proposed standards automakers do not have to manufacture and sell large numbers of hybrids and electric vehicles.