Environmental groups welcomed the president's desire to act on climate change. The Sierra Club called his comments 'heartening.' It said global warming is an urgent issue for the whole world. But many opponents of Mr. Obama's policies disagree. They say it would cost too much for the American economy to move away from using oil and other fossil fuels.环保组织对奥巴马的这一表态表示欢迎.塞拉俱乐部(Sierra Club)称其言论"令人振奋".该俱乐部表示,全球变暖是整个世界亟待解决的一个问题.但许多奥巴马政策的反对者提出了异议.他们表示摆脱石油和其它化石燃料对美国经济的代价会非常巨大.
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