High carbon dioxide levels are associated with warm interglacial periods, and low levels with cold glacial periods.
高二氧化碳含量与温暖的间冰期有关，低二氧化碳含量与寒冷的冰期有关。
2
Recent studies do in fact show that high carbon dioxide levels are associated with warm interglacial periods, and low levels with cold glacial periods.
最近的研究确实表明，高二氧化碳水平与温暖的间冰期有关，而低二氧化碳水平与寒冷的冰期有关。
3
Recently UK researchers linked low solar activity and freezing cold winters in Europe.