We do not know whether lower carbon footprints will always be better for biodiversity.

我们不知道低碳足迹是否总是有利于生物多样性。

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Efficiency is also a great way to lower carbon emissions and help slow global warming.

提高效率也是减少碳排放和帮助减缓全球变暖的好方法。

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But the cleanliness of natural gas is largely based on its lower carbon dioxide emissions when burned.

但是天然气的清洁特性主要是基于其在燃烧时较低的二氧化碳排放量。

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"Development is a right and that should continue but that perhaps paths where there could be a reconciliation of the objective of poverty reduction, enhanced standards of living, a life of greater dignity in developing countries can be reconciled with climate objectives by shifting the sources of energy away from the fossil fuels to the cleaner and lower carbon emissions.

VOA: standard.2009.09.01

We know that ionization energy is going to increase as we go across the periodic table, so that means carbon has a lower ionization energy than nitrogen which is right next to us.

我们知道电离能会随着周期表,向右而逐渐变大，因此碳的电离能比旁边的氮要低一些,那么就像我说的。

麻省理工公开课 - 化学原理课程节选

These companies aim to produce biofuels from renewable non-food sources, with lower carbon emissions to boot.

FORBES: Magazine Article

However, environmentalists believe the grid still represents one of our best hopes for a lower carbon future.

CNN: Can a 'smart grid' turn us on to energy efficiency?

There are a growing number of funds and indexes focusing on clean energy and lower carbon companies.

FORBES: Fossil Fuel Divestment Is A Timely Issue For Investors