Southern Ocean, Antarctica
Warming has carved out fantastic icebergs and icy chunks from the Collins Ice Cap in Antarctica. The continent holds almost two-thirds of the world's fresh water.
Melting ice could mean not only a loss of habitats for wildlife, but also for humans as rising sea levels flood coastal cities and towns.
"Wear Blue for Oceans" Day events and rallies will be held in 10 cities across the nation, including Washington D.C., San Francisco, New Orleans, and Anchorage, Alaska.
To learn more about the campaign and how you can help, visit their website.