大气中温室气体浓度增加
The concentration of greenhouse gases in the atmosphere has increased
以上为机器翻译结果，长、整句建议使用 人工翻译 。
由土地利用、土地利用变化和林业(LULUCF)活动产生的生态系统的固碳作用，是降低大气中温室气体浓度增加速度的重要途径之一。
Enhancing carbon sequestration in land use, land-use change and forestry (LULUCF) is one of the most important means to reduce the growth rate of greenhouse gas concentrations in the atmosphere.
随着人类活动增加，温室气体在大气层中的浓度超过了自然状态，过多热量被保存。
As human activity increases the concentration of these gases in the atmosphere far beyond their natural levels, much more heat is trapped.
导致这一现象的原因可能就是大气层中温室气体浓度增加引起的气候变化，目前大气层中的温室气体浓度已经从1700年的280ppm增加到现在的390ppm (ppm意为百万分之一，大概是指体积的比)。
The reason may well be climate change caused by increasing concentrations of atmospheric greenhouse gases-now roughly 390 parts per million, up from 280 PPM in the 1700s.
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