Written by a conservation biologist, this beautifully illustrated and atmospheric story gently explores the life of a polar bear in a time of climate change. It snowed last night. The first time this season. More is on its way. For a polar bear, winter's first snow is a sign that it's time to make a den--a safe place for her to sleep through the harsh season and give birth to her cubs. But the Arctic is changing; familiar landscapes are melting. What kind of world will her cubs grow up in? The story's clear text and gorgeous, affecting illustrations capture the massive bear's movements amid a crystalline landscape, while quietly observing the loosening ice and other effects of climate change on her life and that of her active cubs. Back matter offers more information and suggestions on how we can help protect the planet for these majestic animals.