The Greenpeace project is part of mission to create a massive Antarctic sanctuary.
The "Stranger Things" star is set to join Greenpeace dancing with penguins in the Antarctic.
Only two Adelie chicks survived of those born to 36,000 adults in Antarctica.
The iceberg has been close to breaking off for a few months.
Experts say the chunk of ice will be larger than the island of Bali.
Rising temperatures have prompted "unprecedented" ecological change across the Antarctic Peninsula.
Scientists from the North and South poles joined the global movement.
Scientists want to know why the green hue shows up at certain times each year.
Huh, it's almost like the climate is changing.