• Why Maritza Morales Casanova believes children are the answer to climate change

  As young children, most of us don't know what we want to be when we grow up. Not Maritza Morales Casanova.

• Growing up wild: This photographer captures the beauty of Mexico's mountains

  Growing up in the remote mountains of Sierra Gorda, Mexico, Roberto Pedraza Ruiz developed a serious case of biophilia.

• Holding back the world’s largest desert

  The world's largest desert is growing. In the last century, the Sahara Desert expanded by more than 10%, now covering an area of more than 3.3 million square miles (8.6 million square kilometers) and spanning 11 countries in the north of Africa.

• Kerstin Forsberg on why we must protect our sea

  Ever since she was a child, Kerstin Forsberg has been fascinated by the ocean.

• How NASA technology can help save whale sharks

  Thousands of people around the world are lending a hand to help save the world’s biggest fish.

• Toughest corals to save dying reefs

  This marine biologist wants to use the world's toughest corals to save dying reefs

• Cleaning up India's Lakes

  From Google to garbage disposal: the environmentalist cleaning up India's lakes

• A century of climate change in Patagonia

  Explorer's mission to photograph a century of climate change in Patagonia

• Indigenous trackers

  Indigenous trackers are teaching scientists about wildlife

• Discovering new species in Chilean Patagonia

  The wild deep: Discovering new species in Chilean Patagonia — before they go extinct

• Spying on illegal loggers

  How old cell phones are spying on illegal loggers

• New plastic recycling method

  Start-up devours pollution with new plastic recycling method

• Call to Earth - CNN

  Call to Earth is CNN’s commitment to reporting on the environmental challenges facing our planet, together with the solutions.