Polar bears are listed as vulnerable to extinction by the International Union for Conservation of Nature (IUCN), with climate change a key factor in their decline. Studies show that declining sea ice is likely to decrease polar bear numbers, perhaps substantially.
What are the two major causes of the decrease in the polar bear population?
Over the next 35-40 years polar bear populations have the potential to decrease by more than 30% according to an assessment by the International Union for Conservation of Nature (IUCN). The report cites climate change and the resulting loss of sea ice as the cause of this probable decline.
Are polar bear populations dropping?
Global polar bear numbers are projected to decline by 30% by 2050.
What is the average lifespan of a polar bear?
LIFE CYCLE: Polar bears can live up to 25 or 30 years in the wild.
Are penguins going extinct?
Is the global warming?
Global warming is the long-term heating of Earth’s climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth’s atmosphere.
Why is Arctic sea ice decreasing?
In the Arctic Ocean, the area covered by sea ice grows and shrinks over the course of the year. Each fall, as less sunlight reaches the Arctic and air temperatures begin to drop, additional sea ice forms.
Is the ice in Antarctica increasing or decreasing?
According to climate models, rising global temperatures should cause sea ice in both regions to shrink. But observations show that ice extent in the Arctic has shrunk faster than models predicted, and in the Antarctic it has been growing slightly.