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FedEx, Walmart, Coca-Cola, PepsiCo and UPS - five of the country's biggest trucking fleets - could cut their fuel use by 500 million gallons a year under the new heavy duty truck fuel efficiency standard, saving $1.7 billion on fuel, according to a Union of Concerned Scientists study.

More than 70 different technologies are available to improve the efficiency of a trucking fleet. These include changes to powertrains and chassis, low-rolling-resistance tires, and enhanced tractor aerodynamics. Finding the right mix to improve a specific fleet can be daunting. Carbon War Room partnered with the North American Council for Freight Efficiency (NACFE) to publish a series of Confidence Reports-objective assessments of the fuel efficiency savings of these technologies. The reports were cited by U.S. EPA in its Greenhouse Gas Pollution Prevention rule-making proposal. 

The EU is considering placing limits on carbon dioxide emissions from commercial trucks, which account for about 25% of the region's road emissions.

ug Power will develop hydrogen fuel cell range extenders for 20 FedEx Express electric delivery trucks.

The mayors of Paris, Mexico City, Madrid, and Athens pledged to phase out cars and trucks powered by diesel engines by 2025. The announcement was made during the C40 Mayors Summit in Mexico City.

A dozen major retailers have joined a push for tougher restrictions on trucking emissions and are asking regulators to push for swifter and steeper reductions in fuel use by the freight sector. The firms, which include General Mills, Ben & Jerry's, Stonyfield Farm, and Patagonia, say stronger standards would help reduce their operating costs and make it easier to pass savings along to consumers.

The natural gas boom that fracking wrought has shaken up the global energy landscape. Now its effects are rippling toward the fuel tanks of U.S. cars and trucks, although a few leaps may be required for natural gas vehicles to go mainstream.

Waste Management's compressed natural gas trucks cut greenhouse gas emissions by 25 percent and reduce particulate matter by 90 percent, Automotive Fleet reports.

Every year, the world produces more than two billion tons of waste - enough to fill a fleet of trash trucks to circle the world 24 times, according to sustainability project the World Counts. The World Bank estimates the yearly global cost of dealing with waste is more than $200 billion and predicts annual waste will exceed 11 million tons per day by 2100 if current trends continue.  But where does it all go? Whether it's an island built as a landfill or the outskirts of historic monuments, the world's waste is piling up with no end in sight. The following images offer an acute reminder of the seriousness of waste management and the desperate need to address it. It's simply not sustainable.

The solar-powered compactor packs 16 yards of loose trash into just 4 yards, reducing waste pick-up at the busy property to just once per week, thus slashing hauling costs by 50 percent, reducing CO2 emissions by more than 14 tons annually, and importantly limiting garbage truck noise to guests and neighboring residents.

The Christmas gifts have been delivered, and Secret Santa is done. Now, the work begins for Optoro, a start-up company that aims to reduce the financial and environmental costs of another great holiday tradition: returns. Little known to shoppers, however, is that a majority of returned items never make it back to retailers' shelves. Instead, the items wind their way through liquidators, wholesalers and resellers, many of the purchases ending up in landfills. According to some estimates, as much as two million tons of returned items - most of it undamaged merchandise - are thrown away each year, enough to fill over 200,000 garbage trucks.

Nearly 50 of the 103 new electric car models expected to debut around the world by 2020 will come from Chinese automakers, an AlixPartners report says. The US consulting firm also forecasts that the sale of cars and light trucks in America will suffer a cyclical drop during the next few years.

Mission Blue, a new initiative launched by National Geographic and Water Aid India, aims to raise awareness about the 76 million people in India who lack access to clean drinking water. The channel and the organization also are working together on MissionBlueMySchool to provide clean drinking water to 2,500 southwest Delhi students, whose school's water supply now depends on tanker trucks

Mayor Bloomber is starting a program to make food composting a requirement. Residents will sort trash in their homes and place food sraps in a brown trash can for curbside pick up. Going to start trial phase soon with actual residents and school