Global warming caused by human activities?a major concern for people all over the world.为什么是has become不应该是have become吗?定语从句的先行词是Global warming 还是 human activities

What cause global warming,can you list some factors?问答题 global warming的作文 global warming是什么意思啊 a global warming是什么意思? what is global warming? what is global warming? Our society is largely (power) by the fossil fuels that cause global warming中“power”该如何解释? 什么是global warming我需要global warming的英文定义. 翻译：what is global warming? 英语翻译The environmental activist intends to step up efforts in raising awareness about the threat of global warming ,a cause close to his heart. climate change and global warming 英语作文 什么是全球气候变暖?（Global Warming） Focus on global warming课文翻译 What can we do about global warming? how will global warming effect Tuvalu?请讲一讲 put it down to global warming意思 全球变暖为什么是Global warming不是Global warmer? 英语翻译regional news portrayals of global warming and climate change