Combo picture shows the Royal Castle in Warsaw, during and illuminated minutes before the start of Earth Hour

Combo picture shows the Royal Castle in Warsaw, during and illuminated minutes before the start of Earth Hour

The Royal Castle in Warsaw is seen during (top) and illuminated minutes before the start of Earth Hour, in this combination picture taken March 23, 2013. Earth Hour, when everyone around the world is asked to turn off lights for an hour from 8.30 p.m. local time, is meant as a show of support for tougher action to confront climate change. REUTERS/Peter Andrews (POLAND – Tags: CITYSCAPE ENERGY ENVIRONMENT ANNIVERSARY)