It therefore takes more energy to transport, and so entails greater emissions of greenhouse gases, which could be reduced by switching to lighter packaging.
因而运输过程中耗费更多能量，使得必排放更多温室气体，转而用更轻的包装能够减少这些气体的排放。
With lighting accounting for some 20% of electricity use worldwide, switching to a more efficient system could both save energy and reduce emissions of climate-changing greenhouse gases.
照明用电约占全球用电总量的20%，改用更高效的照明灯即节能又减少了温室气体的排放。
Even bread and beer can lead to gases as well, especially when switching to a different brand.
即使是面包和啤酒可能导致气体以及，特别是当切换到不同的品牌。
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