Earth Hour 2019 is scheduled from 8.30pm - 9.30 pm local time all over the world on 30th March 2019. Earth Hour is a voluntary and symbolic event that rallies people from around the world to turn off non-essential electric devices to spread awareness on energy consumption and its effects on the environment.According to the Earth Hour website, the event is - an initiative to encourage individuals, businesses and governments around the world to take accountability for their ecological footprint and engage in dialogue and resource exchange that provides real solutions to our environmental challenges. Participation in Earth Hour symbolizes a commitment to change beyond the hourEarth Hour started in Sydney, Australia in 2007 and in 2018, 188 countries and territories took part in the global event.Evidence of climate change can be seen in the abnormal increase in global temperature, extreme weather, melting of the ice caps, increased ocean temperatures and increased acidification of the oceans which is harmful to marine life. The surface temperature of the earth has risen by 0.9 degrees celsius since the 19th Century with most of the increase occurring in the past 35 years. The rise is directly linked to carbon emissions caused by human activity.To take part in Earth Hour, you can organise an Earth Hour event or participate individually by switching off electric devices during the hour.