1·BOULDER, Colo., June 30 (UPI) — climate systems in the arctic may be more affected by global warming than previously thought and may be nearing a climate-change tipping point, a study says.
博尔德,科罗拉多,6月30日(合众国际社)- - -一项研究报告,北极气候系统受全球变暖影响可能比以前所认为的更大,也许正接近气候变化的临界点。