But even earlier readings can provide a record of natural climate variation caused by volcanic eruptions or cycles in ocean circulation. (discovermagazine.com)
It's still unclear whether the jet stream migration and tropical expansion were triggered by natural climate variation or human - caused global warming, the researchers said. (livescience.com)
But for any specific case of loss or damage, the influence of climate change interacts with natural climate variations, as well as the level of exposure and vulnerability to hazards. (newsecuritybeat.org)