But calculating the carbon footprint of a product is far from easy.

但是计算产品的碳质残留物还远不能容易地做到。

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Its carbon Index labels show the carbon footprint per 100g of final product (use-phase emissions are not included).

其碳指标标签标说明的是最终产品每100克得碳足迹(不包括使用阶段的)。

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This minimizes the entire life cycle carbon footprint of a product, providing a long-term emissions reduction solution, rather than looking at just one part of the cycle such as airfreight.

这便把一种产品整个生命周期中的碳排放减到了最低，由此提供了长期减少碳排放的方案。 这比只盯住产品周期中的一环——比如货物空运——要有效很多。

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The fossil fuels used to transport that waste, experts say, is not typically considered in calculating solar's carbon footprint, giving scientists and consumers who use the measurement to gauge a product's impact on global warming the impression that solar is cleaner than it is.

NPR: Solar Industry Grapples With Hazardous Wastes

According to scientists who conduct so-called "life cycle analysis" for solar, the transport of waste is not currently being factored into the carbon footprint score, which measures the amount of greenhouse gases produced when making a product.

NPR: Solar Industry Grapples With Hazardous Wastes