2． 碳足迹，即carbon footprint。简单地说，碳足迹是用来衡量我们在日常生活中消耗的二氧化碳的一种方式。无论是开车上班、乘飞机旅行，还是使用电灯、电脑，我们都消耗石油、煤和天然气等化石燃料。这些化石燃料在燃烧时，会排放出诸如二氧化碳之类导致地球变暖的温室气体。对于carbon footprint，维基百科有如下定义：A carbon footprint is "the total set of greenhouse gas (GHG) emissions caused by an organization, event or product". For simplicity of reporting, it is often expressed in terms of the amount of carbon dioxide, or its equivalent of other GHGs, emitted. 相关表达见如下例句：A new purpose-built office complex that will offer eco-friendly accommodation across 66,250 square feet is under construction in Wales. It is reported that the Cardiff Waterside project, entitled 3 Assembly Square, forms part of a £140 million construction project and will aim to offer business in the area an environment that has a lower carbon footprint than traditional office space. 上述句子的背景是，英国政府成立了一个The Low Carbon Building Programme (LCBP)，即低碳建筑计划，维基百科解释说，LCBP is a Government programme in the United Kingdom administered by BERR (formerly the DTI). It offers grants towards the cost of installing domestic microgeneration technologies and larger scale distributed generation installations for public buildings and businesses, provided energy conservation standards are also met.

3． 低碳技术，即low-carbon technology，这是发展低碳经济，倡导低碳生活的关键之关键，相关例句如下：The Carbon Trust today launched a new 10m pounds low carbon technology investment joint venture to help UK companies develop new low carbon technologies in China. The new joint venture is a partnership with the Carbon Trust and the China Energy Conservation Investment Corporation (CECIC) to develop and deploy low carbon technologies in China.专家指出，低碳技术将成为国家核心竞争力的一个标志——谁掌握了先进的低碳技术，谁就拥有了核心竞争力。低碳技术的面很广，大的技术类型包括节能技术、无碳和低碳能源技术、二氧化碳捕捉与埋存技术，还包括人类可以利用、可以展望到的低碳技术，如核能、风能、太阳能、生物质能、二氧化碳捕捉埋存等相关技术，其中的关键词就是低碳能源（low-carbon energy），如The world will need to spend an additional $10.5 trillion in the next two decades on energy efficiency and low-carbon energy to avoid runaway climate change, according to the International Energy Agency (IEA)。

4． 低碳发展，即low-carbon development/growth，经济发展的一种全新概念与模式。请看如下句子：China has issued a report saying the country is expected to realize by 2050 a low carbon development, featuring low energy demand and carbon dioxide output.

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