The Google Doodle on April 22 marks Earth Day with stark images of the effects of climate change.

It uses real time-lapse imagery to show glacial retreat at Mount Kilimanjaro in Africa and Sermersooq in Greenland

The destruction of Harz Forests in Germany and coral bleaching on Australia’s Great Barrier Reef.

“Today’s annual Earth Day Doodle addresses one of the most pressing topics of our time: climate change,” Google said in a note accompanying the doodle.

“Using real time-lapse imagery from Google Earth Timelapse and other  sources, the Doodle shows the impact of climate change across four  different locales around our planet.”

Google will keep rotating these four images on its homepage throughout the day.

Earth Day marks the birth anniversary of the modern environmental movement in 1970.