这是92年的考研真题中的句子If this warming up took place,the ice caps in the poles would begin to
melt ,thus raising sea level several meters and severely flooding coastal cities.此句的前一句是According to a weather expert's prediction ,the atmospherewill be 3摄氏度 warmer in the year 2050 than it is today ,if man continues to burn fuels at the present state.if引导的条件句是虚拟语气吗?this指代的是state吗?thus引导的部分没看懂,主语是什么呢?能帮我分析下句子的主干是什么吗?英语不好请大家帮帮我!