The real-life Day After Tomorrow: Gulf Stream could COLLAPSE by 2025

Scientists say melting ice in the Northern Hemisphere is disrupting Gulf Stream .

System of currents that brings warmth to Northern Hemisphere could shut down.

Without this, average temperatures could drop by several degrees in North America , parts of Asia and Europe .

Without it, people would see 'severe and cascading consequences around the world'.

Last shutdown was probably at the end of the last Ice Age , 12,000 years ago , and prompted a temperature drop of 5C to 10C in western Europe .

Sea levels could rise up to nearly 20 inches around the North Atlantic Basin , which surrounds the eastern US coast.

In the US , Florida would be particularly badly affected as the flow of water northwards would be halted, seeing it collect on the state's shoreline.