International Earth Day being observed today

First celebrated in 1970, Earth Day is being observed in more than 192 countries today. 

Celebrated every year, organisations around the world observe the day to build support for environmental protection around the world.

Federal Minister for Climate Change Mushahid Ullah Khan said global warming is the biggest risk to the sustainability of the life and the intricate ecosystem on earth, according to Radio Pakistan.

Read: Earth day: Environmentally conscious Karachi

The minister said global warming has made the occurrence of climate change rapid and weathers unpredictable.

He urged for the protection of existing forests and planting new ones for making Earth a sustainable place to live in.

Read: Ignoring the environment: Rawal Lake cleaning project faces delay

More than one billion people participate in Earth Day campaigns every year and it is the largest civic event in the world, celebrated simultaneously around the globe by people of all nationalities, faiths and backgrounds.

In observance of Earth Day, Google also changed its home page.

Many also took to Twitter to share their Earth Day moments.

On #EarthDay remember protecting the earth is a fight for accountability for rights abuses https://t.co/w8XNfVj3Qh … pic.twitter.com/eXCtxK7SqF

— Richard Pearshouse (@RPearshouse) April 22, 2015

https://twitter.com/conorvgalvin/status/590780734454910976

It's our only home, protect it and make it flourish #EarthDay http://t.co/Ck3imp2uHk pic.twitter.com/E858sLR4lv

— Dreamstime (@Dreamstime) April 22, 2015

Giving Grade R's an #EarthDay talk. Teaching our future leaders to take care of the environment! #ChangeMakers pic.twitter.com/BbmrdoBjGK

— Miss Earth South Africa (@missearth_sa) April 22, 2015

I'm a red capped manakin! What's your Earth Day #GoogleDoodle quiz animal? https://t.co/gzDTCX8cRE

— Liverpool Science Talks (@LivSciTalks) April 22, 2015