Every year the world goes dark for one hour, the Earth Hour. The event is organised by the __________________(NATION) World Wildlife Fund. At tourist destinations, in offices and private homes, lights are switched off for one hour at __________________(EXACT) 8:00 pm. The idea is to show that our planet is in danger and it needs care and __________________(PROTECT). It's __________________(POSSIBLE) to remain indifferent to changes in the climate which go on and on. The Earth Hour is not about saving an hour’s electricity. It’s about realising that we live on a __________________(WONDER) planet and need to look after it  — not just for an hour a year but every day. The Earth Hour is a part of an __________________(ECOLOGY) education whose aim is to make people understand their responsibility to the planet.