美國賓州與其他東部10州已簽署一紙協定,同意共同發展一項區域性的低碳燃料標準,以減少交通運輸與其他源頭中的溫室氣體排放量。
車輛可使用的低碳動力燃料包括:氫燃料電池、充電式油電混合車、乙醇,特別是由非糧食作物提煉成的纖維素乙醇燃料車以及生質柴油等等。
賓州州長藍道爾(Ed Rendell)1月6日表示,「這項夥伴計劃再搭配本州現行的能源政策,預計不但可有效減少溫室氣體排放量且發展潔淨能源,在這樣環境更加清淨的努力下,最終將可促進經濟成長同時保護我們的地球。」
其他10個共同簽署協定的州有康乃狄克州、德拉瓦州、緬因州、馬里蘭州、麻州、新罕布夏州、新澤西州、紐約州、羅德島及佛蒙特州。
事實上,此次締約的11個州已是美國「區域溫室氣體倡議」(RGGI)的成員,是美國國內首次以維持市場基礎、義務性削減溫室氣體排放的共同行動。
賓州1月6日所簽署的區域性低碳燃料標準的推動歷程最早可追溯至2008年6月,當初麻州州長派翠克(Deval Patrick)致函RGGI 10州的州長,冀望攜力制訂一項區域內全面通用的低碳燃料標準。而麻州州內自4月起,便已先行頒布低碳燃料標準。
未來締約的11個州將與專門研究區域性低碳燃料標準的「東北州際協調空氣使用管理機構」合作。另外,東部11州亦不排除與聯邦政府和其他州發展合作行動,藉以影響聯邦標準的制定或其他倡議中燃料政策的走向。
待低碳燃料標準的發展至臻完善,夥伴計劃中的11州州長接下將必須思索如何去實行。
目前廣泛討論能減少溫室氣體排放的燃料包括:新一代生質燃料,如使用纖維素乙醇排放出的碳生命周期較短,且將可避免如耕地轉作與地主變更土地用途的副作用,不像今日市場上由玉米提煉的乙醇,造成各地地主與農民視玉米為黃金,一窩蜂地大遍種植。
不只低碳燃料標準,東部11個州中不少成員早已個別實行縮減溫室氣體排放的政策。舉例來說,賓州於2008年頒行《氣候變遷法》並設一審議委員會,負責研究並報告氣候變遷的潛在影響以及賓州未來的經濟立基。
該委員會亦須擬訂符合經濟效益的行動計劃,以減少或抵銷州內溫室氣體排量,同時輔導環境保護部(DEP)彙編州內溫室氣體排放總量與來源的年度報告。
Pennsylvania has signed a letter of agreement with 10 other eastern states to reduce greenhouse gas emissions from transportation fuels and other sources by developing a regional low carbon fuel standard.
Vehicles using low carbon transport fuels include cars powered by hydrogen fuel cells; electric cars such as plug-in hybrids; cars fueled with ethanol, especially cellulosic ethanol made from non-food plant materials; and cars fueled with biodiesel.
"In conjunction with Pennsylvania's energy policies to reduce greenhouse gas emissions and increase clean energy development, this work done by this partnership will ultimately grow our economy and protect our planet by fostering a cleaner environment ," Governor Ed Rendell said on Monday.
The other states in on the agreement are Connecticut, Delaware, Maine, Maryland, Massachusetts, New Hampshire, New Jersey, New York, Rhode Island and Vermont.
The 11 states already are partners in the Regional Greenhouse Gas Initiative, RGGI, the first mandatory, market-based effort in the United States to reduce greenhouse gas emissions.
The push towards a regional low carbon fuel standard started in June 2008 when Massachusetts Governor Deval Patrick sent a letter to the governors of all 10 RGGI states inviting them to cooperate on a standard that would apply to the entire region. Massachusetts committed to developing a low carbon fuel standard for the state last April.
The 11 states will collaborate with the Northeast States for Coordinated Air Use Management, which has been studying a low carbon fuel standard for the region. The eastern states also have agreed to work cooperatively with other states and the federal government, and to influence the design of any federal standard or other proposed fuel policy.
Once the low carbon fuel standard is developed for the eastern region, governors from participating states will have the opportunity to consider implementation.
Fuels that may reduce greenhouse gas emissions include advanced biofuels like cellulosic ethanol, which have lower lifecycle carbon emissions and may be less likely to cause indirect effects from crop diversion and land use changes than biofuels on the market today such as ethanol made from corn.
Many of the 11 states in the partnership have set individual policies for reducing greenhouse gas emissions. Pennsylvania enacted the Climate Change Act last year, establishing an advisory committee to create a report on potential climate change impacts and economic opportunities for the commonwealth.
The committee also will write an action plan for cost-effective strategies to reduce or offset the state's greenhouse gas emissions and help the Department of Environmental Protection, DEP, compile an annual inventory of the sources and amounts of greenhouse gas emissions generated within the state.