求翻译：　目前，环境污染的日趋严重已构成一全球性重大问题，同时也是导致全球变暖的主要因素之一。现在，关于全球气候变化的研究已经明确指出了自上个世纪末起地球表面的温度就已经开始上升。是什么意思？

Currently, the increasingly serious environmental pollution constitutes a major global problem, but also led to one of the main factors of global warming. Now, with regard to global climate change research has clearly pointed out that since the last century from the Earth's surface temperature has a

At present, the increasingly serious environmental pollution has become a major global issue, and a major factor leading to global warming. Now, on the global climate change research has clearly pointed out that since the end of the 20th century from the surface of the earth's temperature has alread

　At present, the environmental pollution day by day serious constituted a global major issue, simultaneously also is causes the whole world to change one of warm primary factors.Now, already was clear about about the whole world climatic change research had pointed out got up the earth's surface tem

　At present, the increasingly serious environmental pollution has a significant global problem, but also one of the major factors leading to global warming. Now, research on global climate change has made it clear that with effect from the last century the Earth's surface temperature has already beg

Currently, the increasingly serious environmental pollution constitutes a major global problem, but also led to one of the main factors of global warming. Now, with regard to global climate change research has clearly pointed out that since the last century from the Earth's surface temperature has a