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Farming is becoming ever more difficult on lands that are getting hotter and drier.

Related Article: The Ominous Story of Syria's Climate Refugees

Despite some drama and tension at the COP21 meeting, world leaders and their negotiators are surprisingly optimistic

Le Bourget, Paris — Momentum continues to build here for a landmark agreement to combat climate change. More than 170 countries have already submitted plans for climate steps they will take, which pave the way for a deal. Remaining issues include mechanisms for transparency that would ensure nations live up to their commitments, how much money will be available to help struggling nations adapt to climate change or deal with loss and damage from extreme weather, and whether commitments will be revisited and made more ambitious in the future. Yet hopes are high. As U.S. Secretary of State John Kerry noted at an event today: "I am so hopeful that Paris will be a truly historic moment."

This article was reproduced with permission and is a Nature Video production.

Pets and people shed clouds of microbes as unique and personal as their fingerprints, but the clouds can change over time.

What will a world that is a few degrees hotter look like? As negotiators gather in Paris, reporter Adam Levy investigates some of the effects that temperature changes will have on our planet.

This article was reproduced with permission and was first published on November 20, 2015. It is a Nature Video production.

World leaders will soon meet in Paris, tasked with stopping the world from heating up by more than 2 degrees. Nature Video investigates the basis of this limit, and how much carbon we can burn before we reach it.

This article was reproduced with permission and was first published on November 19, 2015. It is a Nature Video production.

The Paris climate talks are nearly upon us, and the world’s nations are gathering to hammer out a deal. But how do you get an agreement that everyone will sign up to?

This article was reproduced with permission and was first published on November 23, 2015. It is a Nature Video production.

All it takes is a magnet and knowing where to look.

In his West London workshop, Michael Wright builds ancient mechanisms. In this Nature Video, we see his latest contraption, the sphere of Archimedes. Based on little more than ancient Greek texts, Wright has built this speculative machine to model the movements of the planets. 

This article was reproduced with permission and was first published on September 25, 2015. It is a Nature Video production.

Nature Video finds out how to levitate objects using sound waves. Scientists can float objects in mid-air, using just the power of sound. Now, using ultrasonic speakers, they can levitate things with more control than ever before, moving small objects in three dimensions even with the whole array turned upside down. They have also developed virtual ‘holograms’ to visualise how the shapes made by the sound waves can ‘grab’ objects.

This article was reproduced with permission and was first published on Oct 27, 2015. It is a Nature Video production.

Radioastronomer Robert Wilson recalls a pair of pigeons who almost thwarted the discovery of cosmic background radiation. Wilson’s discovery—“the echo of the big bang”—earned him a share of the 1978 Nobel Prize in Physics.

This is the story of the evolution of life on earth during one photon’s journey across the universe. Told by Saul Perlmutter who shared the 2011 Nobel Prize in physics for the discovery of the accelerating expansion of the universe.

How to break a fundamental law of physics and win a Nobel Prize to boot. Stefan Hell explains super-resolved fluorescence microscopy for which he shared the 2014 Nobel Prize in Chemistry.