为什么温室效应叫"greenhouse effect"

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• objective effect 原句是Some people think giving aid to poorer countries has more objective effects than positive effects.我从字面上理解是客观效果，但什么叫客观效果？什么叫作客观效果比积极效果？如果理解为消极作用，那为什么不用negative？
• 1、Our world is in danger.The greenhouse effect may cause the level ofthe sea to rise and flood cities and even the whole ______________.(country) 是country还是countries,为什么?2、Tom has great ___________ incollecting stamps and travelling around the world.(interesting) 是interest还是interests,为什么?
• 为什么温室效应叫"greenhouse effect"
• 英语句型分析We cannot say definitely that the temperature rises are due to the greenhouse effect,the heating may be part of a "natural" variability over a longtime-scale that we have not recognized in our short 100 years of recording.1、rises 在这儿是名词吧,为什么加复数.2、that we have not recognized in our short 100 years of recording.什么句型,that后面的句型修饰什么.3、还有 the heating 前面的逗号，是否缺少连词啊，英语中不是说逗号不能单独连接两个句子吗？
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