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

This new edition of the guide the 17th since the first version was released in 2006 adds new criteria to evaluate companies based on their carbon footprint, use of renewable energy, sourcing of paper fiber and conflict minerals, and product life cycle analysis.

FORBES: How Green Are Your Gadgets?