1. NASA recently released a shocking animation
The animation shows a rapid decline in Arctic's Perennial ice. You might be wondering what Perennial ice is? Well, it is that portion of sea ice that survives the summer melt season.
2. Arctic sea ice in September 1984.
As the temperature shifts through seasons every year, the Arctic ice reaches it's maximum and minimum. The white portion visible in the picture is the perennial ice. It's the thickest ice that can last up to 4, or even 9 years or more without melting in warmer summer months.