Tourists kissing front of Malaysia's landmark Petronas Twin Towers with lights on before turned off to mark Earth Hour 2016 in Kuala Lumpur, Malaysia, 19 March 2016. Earth Hour takes place worldwide at 8.30 p.m. local time and is a global call to turn off lights for 60 minutes to raise awareness of the danger of global climatic change (Photo by Fazry Ismail/EPA)

These are the dunes of the Namib Desert, taken by Korea's Kompstat-2 satellite. The blue and white area is the dried riverbed of the Tsauchab river. (Photo by The European Space Agency)

A group of San Bushmen from the Khomani San community practice their hunter-gatherer craft in the Southern Kalahari desert on October 15, 2009 in the Kalahari, South Africa. One of the largest studies of African genetics by an international team from the University of Pennsylvania, published in April 2009, revealed that the San of Southern Africa are the most genetically diverse on earth, and that the San homeland could be the spot where modern humanity began. (Photo by Dan Kitwood/Getty Images)

Chinese artist Song Dong stands in his installation entitled “Waste Not” in The Curve at the Barbican Art Gallery on February 14, 2012 in London, England. Waste Not comprises over 10,000 objects collected by Song Dong's mother over a period of 5 decades. The installation is Song Dong's first major solo exhibition in the UK and opens to the general public on February 15, 2012. (Photo by Oli Scarff/Getty Images)

Russian support personnel work to help get Expedition 29 crew members out of the Soyuz TMA-02M spacecraft shortly after the capsule landed with Expedition 29 Commander Mike Fossum, and Flight Engineers Sergei Volkov and Satoshi Furukawa on November 22, 2011 outside of the town of Arkalyk, Kazakhstan. NASA Astronaut Fossum, Russian Cosmonaut Volkov and JAXA (Japan Aerospace Exploration Agency) Astronaut Furukawa are returning from more than five months onboard the International Space Station (ISS) where they served as members of the Expedition 28 and 29 crews. (Photo by Bill Ingalls/NASA via Getty Images)

Extraordinary tales of everyday heroism have been illustrated beautifully by renowned US photographer Steve McCurry in the new 2015 Lavazza Calendar. The calendar which has been created in collaboration with the Slow Food movement, features twelve breathtaking pictures, capturing the spirit, strength and humanity of the Earth Defenders – women and men who protect their land and projects in Africa with passion and bravery. The proceeds from sales of the calendar and all donations will be contributed entirely to create 10,000 food gardens in African schools and villages by the end of 2016. (Photo by Steve McCurry/2015 Lavazza Calendar)

The new Amazon tablet called the Kindle Fire is displayed on September 28, 2011 in New York City. The Fire, which will be priced at $199, is an expanded version of the company's Kindle e-reader that has 8GB of storage and WiFi. The Fire gives users access to streaming video, as well as e-books, apps and music, and has a Web browser. In addition to the Fire, Bezos introduced four new Kindles including a Kindle touch model. (Photo by Spencer Platt/Getty Images)