Obama also mentioned that he had raised fuel-economy standards for cars in the US, and had invested in renewable energy sources, like solar and wind power. But, when Romney talked about increasing coal production, Obama neglected to point out that carbon dioxide from coal-fired electricity generation is already a major contributor to climate change; that we still lack the technology to produce “clean coal”; and that increasing the use of coal will impose huge burdens on people worldwide.
奥巴马还提到，他已经推出了美国的汽车节能标准，并对太阳能和风能等可再生能源投入了资金。但是，当罗姆尼摊到煤产量的上升时，奥巴马并未指出煤电所产生的二氧化碳已成为气候变化的重要原因；而我们仍然缺少生产“清洁煤”的技术；而煤使用的增加会给全世界人民带来重大负担。