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The Biden administration on April 26 took a key step toward restoring California’s power to limit greenhouse gas emissions from vehicles and overturn a Trump-era policy that pitted the federal government against a state seeking to eventually ban conventional gas-powered cars.

While diesel prices remained flat according to data released this week, experts are warning of rising prices headed into summer as a shortage of tank truck drivers threatens to tighten supplies.

Massachusetts Gov. Charlie Baker signed an executive order to reduce greenhouse gas emissions within state facilities, including those for transportation.

Cummins Inc. and Tula Technology Inc. announced Tula’s diesel Dynamic Skip Fire (dDSF) software was effective in reducing nitrogen oxides and carbon dioxide emissions on a Cummins X15 HD Efficiency Series diesel engine.

The push for zero-emission trucks in California has left drayage operators questioning that approach in light of their previous investments in equipment using natural gas fuel, an industry association executive said.

Progressively tougher clean air mandates and the increasing corporate focus on environmental sustainability could signal a larger role for natural gas — especially renewable natural gas — as a trucking fuel, experts said.

President Joe Biden invited world leaders to join the U.S. in driving a “fourth industrial revolution” to transform the energy sector, create jobs and overcome the threat of climate change, capping his two-day summit on global warming April 23.

Dealers and other fleet-­servicing shops are coming to terms with the growing shift toward electric fleet vehicles. If enough truck dealerships are slow to adopt, “it may slow down the rollout or it may lead to another service model, such as through third parties or national service chains,” said Mike Roeth, executive director for the North American Council for Freight Efficiency.

The U.S. Transportation Department is moving to reverse former President Donald Trump’s bid to end California’s ability to set its own automobile tailpipe pollution standards.