Arguably the biggest problem in the world is environmental crisis and a significant part of it could be attributed to the hazards of global warming. As the ozone layer continues to deplete, it triggers problems like melting of the polar ice caps, excess drought and other paraphernalia; that ultimately take us a step closer to extinction. These before and after pictures show the impact of global warming:

Rocky Mountain National Park - USA

The Great Barrier Reef - Australia

The Danube River - Germany

Muir Glacier - Alaska, USA

Lake Chad - Chad

San Blas Archipelago - Panama

Dibba - UAE

Whitby Harbour - England

Rhone Glacier - Switzerland

Carroll Glacier - Alaska

Imja Glacier - Nepal

Boulder Glacier - USA

California - USA

Grinnell Glacier - USA

Pedersen Glacier - Alaska, USA

Petermann Glacier - Greenland

Mount Kilimanjaro - Tanzania

Iceberg B-31 - Antarctica

Time to act, before it gets too late.