Alaska Airlines came in second with three leafs, scoring well in recycling, building design and carbon efficiency.
Each car was scored for its performance in terms of air pollution, fuel efficiency and carbon footprint ratings.
"It has been suggested to us that some of the claims about fuel efficiency and carbon issues are fundamentally deceiving, " he said.
As an EDF Climate Corps fellow with eBay, Megan Rast took the challenge to make the business case for energy efficiency and carbon reduction initiatives this summer.
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Second, he can use this visit to spotlight efforts China is making, or has pledged to make, to hold down the growth of carbon emissions, promote efficiency and invest in the development of solar, wind and other renewable energy sources.
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Nanoscale carbon, for example, is enabling greater efficiency and longer lifetimes for the familiar activated carbon water filter.
Everyone agreed that short term strategies to reduce carbon emissions relied on energy efficiency.
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That is even though the commission's energy policy is to improve efficiency and cut carbon emissions.
Further improvement is needed in energy efficiency and reducing carbon dioxide emissions per unit of GDP, with carbon taxation preferable to emissions trading.
He says this will create regional jobs, increase resource security, reduce consumption of non-renewable resources, increase material efficiency and prevent carbon emissions and industrial waste - all on a big scale.
El Hierro biosphere reserves aims to increase energy efficiency and reduce carbon emissions further with a Sustainable Mobility Plan (PDMS), since 50% of the energy consumed on the island is used for transportation.
Broadly speaking, this means carbon footprint reporting and building energy efficiency and monitoring, analyzing, reporting and reducing energy consumption.
Another team from a public high school in one of the most disadvantaged neighborhoods in Philadelphia successfully created a low carbon emissions and ultra-high efficiency alternative fuel vehicle which competed against collegiate and corporate teams.
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Mr Bloomberg says the president has taken "major steps" to reduce the US carbon consumption, including new fuel-efficiency standards for vehicles.
The cars compete for a Green Challenge award, which recognizes the race teams with the best overall performance, the highest level of fuel efficiency, and the lowest carbon emissions.
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Finally, the same energy policies which drove increased reliance on renewable generation and energy efficiency requirements have also contributed to carbon emissions reductions.
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His not-for-profit organization, Carbon Manna Unlimited, has developed a system of direct micro-payments to rural people who offset their carbon production through the use of high-efficiency stoves.
Businesses typically measure sustainability either by counting reductions specific to each domain (BTUs, gallons, kWhs), or they equate sustainability with carbon or cost reductions (typically gained through efficiency improvements).
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Why is it, I asked, have the power firms meekly accepted the government's requirement to deliver Whitehall policy on the shift to lower carbon and renewable power, while funding energy efficiency measures, smart metering and the social tariffs that support poorer customers?
In an earlier report, the Royal Academy of Engineering had mapped out the scale of the task involved in moving to a low-carbon electricity supply - with a mix of energy efficiency, renewables, nuclear and clean coal.
Smart communities should become their own REITS: asset-backed smart domicile securities that comport, for example, with all those gated communities around the world where locally-produced energy can be amortized, quantified, and the carbon footprints micromanaged for cost savings and greater energy efficiency.
In 2008 we'll see improved fuel-efficiency standards for cars and new legislation governing carbon emissions.
And lastly, increasing the efficiency of electricity supply and demand could reduce carbon dioxide emissions by up to 10 percent.
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The Lib Dem proposals would include a five-year plan to insulate every school and hospital, subsidies for home energy efficiency, 40, 000 new zero-carbon homes, improvements to rail lines and 700 new train carriages.
The government is consulting on new rules to be introduced in 2014 saying that home improvements usually lead to a rise in carbon emissions and homeowners should be made to improve energy efficiency in the rest of the house.
While other factors, including a sluggish U.S. economy and increasing energy efficiency, have contributed to the decline in carbon emissions from factories, automobiles and power plants, many experts believe the switch from coal to natural gas for electricity generation has been the biggest factor.
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Big efficiency gains will come only if Europe's carbon cap includes housing and transport.
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Together with renovating hydroelectric dams and increasing efficiency, this will continue the three most important carbon-reduction strategies we have ever had.
Last week the Senate passed a substantial but flawed energy bill, which imposed tougher fuel-efficiency standards on cars but failed to consider a carbon tax or a cap-and-trade system.
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