GMA: As many parts of the world are expected to turn off lights temporarily on Saturday as they celebrate Earth Hour, the United Nations expressed its support for the endeavor and called for action against "increasingly extreme weather." In a message posted to the Earth Hour YouTube page, UN Secretary-General Ban Ki-moon said the weather has been harming the global population and that people should do their part for a "cleaner, greener world." "On March 23rd, the United Nations will join millions of...