I am writing as regards my thoughts for Polar bears, the poster-child for climate change, are among the animals most affected by the seasonal and year-to-year changes in Arctic sea ice, because they rely on this surface for essential activities such as hunting, traveling and breeding. The researchers recommend that the National Climate Assessment incorporate the timing of spring ice retreat and fall ice advance as measures of climate change in future reports. The study's results currently are used by the International Union for Conservation of Nature's polar bear specialist group, which completes assessments of polar bears and issues the species' conservation status. I am really pleased with this information.