Calamba, Laguna – This year SM City Calamba will again participate in the annual Earth Hour with the aim to help save the planet from global warming. This year’s theme is “Use your Power”, partnering with our friendly neighbourhood superhero, Spiderman, as the first ever superhero ambassador in the intention to inspire individuals to use their power to become the Superheroes of the planet.  The ceremonial switching off of lights will happen on March 29, 2014 at 8:30 pm to 9:30 pm.