Carbon activity sites, inherent catalysts and diffusivity of the reactant gases within the pores of the chars played key role in the gasification process.

煤焦表面的活性点、煤焦内在的催化剂以及反应气在煤焦孔隙之间的扩散能力是影响煤焦气化反应活性的重要因素。

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Grazing herds stimulate microbial activity in the soil, helping to capture water and separate carbon.

放牧能刺激土壤中的微生物活动，帮助水分的获取和碳的分离。

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When there's more solar wind activity, less carbon-14 is produced.

太阳风活动越频繁，产生的碳14就越少。

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But cement manufacturing produces around five percent of the carbon dioxide released by human activity worldwide.

VOA: special.2009.12.01

More importantly, a successful voluntary carbon market moves green low carbon economic activity into the free market domain, rather than the mandatory one we currently find ourselves in.

FORBES: BY DENNIS POSADAS

The criteria considered include population density, the distance to underground geological formations suitable for carbon sequestration, seismic activity, terrain, proximity to airports, military bases and so on and so forth.

FORBES: Plotting The Next-Generation U.S. Power Grid

The draft curriculum for geography does not contain references to climate change but a section called "Earth science" in the chemistry syllabus says 11- to 14-year-olds should be taught about "the production of carbon dioxide by human activity and the impact on climate" and includes a section on "the efficacy of recycling".

BBC: Keep climate change lessons in curriculum, urge petitions