Earth day is being celebrated all over the world today to demonstrate support for environmental protection. The theme for this year is "Trees for the Earth" with the aim of mobilizing nearly eight billion plantings over the next five years. The Day recognises that the Earth and its ecosystems provide its inhabitants with life and sustenance. Earth Day began in 1970 as a day to celebrate the planet and encourage people to be more environmentally friendly. <br/><br/>Prime Minister Narendra Modi has asked the people to work together to ensure sustainable development and a pollution free planet. In a tweet, Mr. Modi said, trees help mitigate climate change and purify the air. He also asked to take pledge to plant more trees and create green earth.