Chinese ⇄ English

过去的十年、为了让二氧化碳在大气中的含量稳定在550 * 10⁻⁶、有人呼吁采取极端的行动
expl.	Calls for drastic action have bee made within the last decade in order to achieve stabilization of CO₂ levels at around 550 ppm twice the preindustrial era levels。