although some areas are relatively unaffected now, climate change is a global problem.
讲解：
relatively 相对地
unaffected 不被影响的、没被影响的
climate change 气候变化
global 全球的
one major concern is that rising temperatures in the arctic are causing the polar ice cap to melt, which in turn is leading to rising sea levels.
讲解：
major concern 主要的问题/担心
rising temperatures 不断上升的气温
the arctic 北极地区
cause v. 引起
polar ice cap 极地冰冠(the ice caps are the thick layers of ice and snow that cover the north and south poles.)
melt 融化
in turn 相应地、转而
lead to sth 引起...
rising sea levels 水平面上升
climate change will not only have a severe impact on people, but also devastate the natural world and lead to the extinction of important species.
讲解：
have a severe impact on ... 对...产生严重的影响
devastate 破坏
extinction n. 灭绝 extinct adj. 灭绝了的
species 物种
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