The new US analysis suggests this may not be a sensible strategy, given that the total carbon footprint appears bigger - especially if the gas comes from shale formations.

一份新的分析指出，这样做并不是一种好的策略，指出总的碳影响变得更大--特别是如果此类其他来自于页岩层。

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SPSS factor analysis is further used to ensure that total organic carbon is the key factor which limits the PHEs vertical distribution.

同时利用SPSS的因子分析法进一步确定总有机碳是制约菲垂向运移的主要因素。

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