在做英语考研题时请问这句的that指代什么Theauthorassociatestheissueofglobalwarmingwiththatofsmokingbecausetheoutcomeofthelatteraggravatestheformer.翻译时smoking修饰那个that,若是that指代之前的issue也

　　在做英语考研题时请问这句的that指代什么

　　Theauthorassociatestheissueofglobalwarmingwiththatofsmokingbecausetheoutcomeofthelatteraggravatestheformer.

　　翻译时smoking修饰那个that,若是that指代之前的issue也感觉翻译的不对,请问一下that是指代什么