Updated 2:10 p.m. ET, 2/18/2014
Washington (CNN) - President Barack Obama took the next step on Tuesday in his administration's effort to cut emissions and reduce oil use through better fuel economy on the nation's highways.
Speaking at a Safeway distribution center in Maryland, Obama instructed environmental and transportation agencies to get to work on the next round of gas mileage requirements for big trucks.
"Five years ago, we set out to break our dependence on foreign oil," Obama said. "Today, America is closer to energy independence and we have been in decades.
"For the first time in nearly 20 years, America produces more oil here at home than we buy from other countries. Our levels of dangerous carbon pollution, that contributes to climate change, have actually gone down even as our production has gone up," he said.
Obama's plan builds on a 2011 regulation that set the first-ever fuel standards for medium- and heavy-duty trucks for model years 2014-18. It aims to save some 530 million barrels of oil and cut emissions by roughly 270 million metric tons.
Now, the Transportation Department and the Environmental Protection Agency - as planned - must develop the next phase of targets for those vehicles for post-2018 model years.
Obama wants them in place by March 2015.
"What we were clear about what was, if you set a rule, a clear goal, we would give our companies the certainty that they needed to innovate and out-build the rest of the world," he said. "They could figure out if they had a goal that they were trying to reach, and thanks to their ingenuity and our work, we're going to meet that goal."
The effort does not require congressional approval.
Obama has facilitated aggressive increases in auto and truck fuel efficiency since taking office. Industry in most cases has responded with cleaner-burning engines, lighter and more aerodynamic designs and models that appeal to consumers hungry for fuel savings.
Frances Beinecke, president of the Natural Resources Defense Council, praised the latest announcement.
"Strong heavy truck efficiency standards will not only cut carbon pollution that fuels climate change, but also save consumers money every time they go to a store and save truckers money at the pump," Beinecke said.
Trucking industry leaders supported the latest proposal as well.
Congressional Republicans called the announcement old news, and urged Obama to join them in working on legislation that would create jobs.
"Surely in the past 20 days, the President could have found time to pick up his pen and respond to Congress," said Rory Cooper, communications director for House Majority Leader Eric Cantor. "It's abundantly clear that President Obama is not interested in working with Congress to solve the problems facing working middle class families."
In his State of the Union address, Obama promised that 2014 would be a "Year of Action" and he would take steps through executive action in various policy areas that do not need congressional backing.
In Maryland, he touted actions he's taken since that speech in January, including raising the minimum wage for federal contractors, ordering a review of job training programs and creating a new way for low-wage workers to save for retirement.
Heavy-duty vehicles, including trucks, buses and vans, rank behind cars in the production of greenhouse gas emissions in the transportation sector, according to the Transportation Department.
Obama chose to make the latest announcement at Safeway because the company "has been a leader in improving trucking efficiency," a White House official said, adding that it has invested in "cleaner" technologies, improved aerodynamics, more efficient tires and larger capacity trailers.