globlewarming全球变暖greenhouseeffect温室效应carbondioxide二氧化碳risingtemperature温度上升climatechanges气候改变sealevels海平面arctic极地Environment环境emissions释放Earth'ssurface地球表面Humanactivities人类活动fossilfuels化石燃料Weatherpatterns气候类型Extremeweatherconditi极端气候条件atmosphere大气greenhousegases温室气体sideeffects副作用sustainabledevelopment可持续发展coal煤naturalgas天然气oil石油protecttheearth保护地球theicecaps冰冠disasters灾难Titanic泰坦尼克threat威胁solution解决方案renewableenergy可再生能源phenomenon现象catastrophe灾难