Climate change is one of the biggest issues facing world leaders today, and it is not just posing environmental and humanitarian challenges. The issue is also now forcing nations to look at the impact on security, both at home and beyond national borders. Al Jazeera's Tom Ackerman reports from Washington DC. Subscribe to our channel http://bit.ly/AJSubscribe Follow us on Twitter https://twitter.com/AJEnglish Find us on Facebook https://www.facebook.com/aljazeera Check our website: http://www.aljazeera.com/
