In his tweet, Modi said: "#EarthDay is the perfect occasion to reaffirm our commitment to keep our Planet clean, green & focus on sustainable development."
"We belong to a culture that believes in the Mantra- Earth is our Mother & we are her children," he said.
The Prime Minister said: "Caring for the environment is an integral part of our ethos. India can truly show the way to the world in mitigating climate change."
Earth Day, a day to increase awareness and appreciation of the Earth's natural environment, is being observed around the planet on Wednesday.