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Mountains keep growing and growing and growing for many millions of years until they are so heavy that they can no longer grow taller, only wider. Photo by Jeff Finley on Unsplash

Curious Kids: how do mountains form?

When I was little, geologists worked out Earth's surface was made of pieces, like a giant puzzle. Those pieces, called “tectonic plates”, move and bump into each other and mountains form.
The United Nations says people “left behind” include those vulnerable to the effects of climate change, but aren’t the furthest behind those damaging the environment? Here, a man rides a bicycle through a devastated Homs, Syria. Numerous studies say climate change was a factor in record-setting drought, one of several causes of the country’s civil war. AP Photo/Dusan Vranic

‘Leaving no one behind’ conveys a paternalistic approach to development

The United Nations Declaration on sustainable development stresses "leaving no-one behind," but what about the factors that cause many to be behind in the first place?
The spix macaw is considered to be extinct in the wild.“

Debate: Mobilizing collective intelligence for the ecological transition

Rapid environmental decline is a major threat, yet education is not mobilised to empower children. Fortunately, many initiatives explore how to make students actors of the ecological transition.
The extinction of dinosaurs is one of the many periods of mass extinctions on earth. www.shutterstrock.com/Jaroslav Moravcik

5 periods of mass extinction on Earth. Are we entering the sixth?

Scientists believe since 2010 we have entered the sixth period of mass extinction. CO2 emissions will change the lives of plants and animals in the next three to four decades.
The mass of the Earth is big enough that the gravitational force it creates can pull the hard shape of ice, rock and metal into a sphere. NASA Earth Observatory images by Joshua Stevens, using Suomi NPP VIIRS data from Miguel Román, NASA's Goddard Space Flight Center

Curious Kids: Why is the Earth round?

Imagine the Earth pulling everything it is made up of, all of its mass, towards its centre. This happens evenly all over the Earth, causing it to take on a round shape.
Lasers being shone from the European Southern Observatory’s Very Large Telescope in Chile. These lasers help remove the twinkles in the night sky and help astronomers see stars clearer on Earth than ever before. F. Kamphues/ESO

Curious Kids: Why do stars twinkle?

How exactly do the stars twinkle in the night sky? As it turns out, the answer is full of hot air... and cold air.

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