On the outskirts of the city , smokestacks belched carbon and sulfur into the putrid mist that enveloped them .

在城市的郊区，烟囱向周围的薄雾喷出碳和硫磺。

Following this first " warm and wet " period , the face of mars began to change drastically as volcanoes belched out sulfur , oxidized , and formed corrosive acid rain .

在这个“温湿”的第一个时期之后，随着火山爆发，喷出硫磺，产生氧化，并形成腐蚀性的酸雨，火星的表面开始发生剧烈的变化。

Air pollution was not the most immediate of problems but the canopy of smoke that belched from industrial and domestic chimneys began to attract attention .

虽然空气污染不是最紧迫的问题，但是不断从工厂和住家烟囱里喷出的弥天烟雾开始引起大家的关注。

The huge amounts of methane stored in the arctic permafrost are belched into the atmosphere , causing more warming .

在北极永久冻土层储存大量的甲烷会喷到大气中，造成变暖加剧。