Arctic sea ice had its weakest winter buildup since record-keeping began 47 years ago. It is a symptom of climate change that will have repercussions globally, scientists said Thursday.

Dr. Boisvert compared the freezing and melting of sea ice between winter and summer to the heartbeat of the planet. The pulses between the winter maximum and summer minimum used to be shorter.

Our planet is getting warmer every year, but over the last couple of years in the Swiss Alps, that's on epic display. And while glaciers in Switzerland lost *** record amount of ice last year ...