Home » One animal is being displaced on a scale our planet has never experienced before

Climate change is exacerbating the displacement of a single animal species, on a scale our planet has never experienced before. In an interview with Bill Gates on CBS news, Gates says, if we wait too long:

Then the natural ecosystems will have failed. The instability, you know, the migration. You know, those things will– will get really, really bad well before the end of the century.

Gates is referring to the mass migration of people, of climate refugees. This is a trait largely reserved for human animals.

In fully functioning ecosystems, animals don’t migrate because they are desperate to find food, they migrate because they are moving to where it’s expected. They are behind the process that enhances vegetation diversity, fertilises soil, stabilises climate and amplifies nutrients. There are times when natural climate cycles will have caused animals to move further and there have been periods of mass mortality of animals as a consequence, but these are the exception, not the rule (at least not in time-scales of a few million years).

The migration of Short-tailed Shearwaters takes them between some of the most significant ocean upwelling zones in the world and their sheer numbers contribute enormously to ocean processes that build our global fisheries and stabilise climate. Short-tailed Shearwaters contribute over 5,000 tonnes of nitrogen a year, rivalling the natural nutrient input of entire ecosystems like the Great Barrier Reef. They integrate it precisely within nutrient cycles, so none goes to waste. Disconnecting them from the physical ocean and atmosphere (through huge population decline), throws the system into chaos, causing untold damage to climate and fisheries.

The transfer of nutrients by wildlife is the very root cause for the evolution of animal migration–and indeed, the key to how animals survive on Earth for millions of years – it is tied to their own behaviour and the positive impact they have on the planet. They know where to find food, because that’s where they left it!

It’s not just about long-distance migrants though. The pattern of movement of everything, from the daily perambulations of caterpillars onto the leaves of plants, to the prevalence of tropical diseases, are all changing due to the breakdown in natural systems that support ecosystem stability.

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But sixty percent of all mammal, bird, fish and reptilian lifeforms have been exterminated in the last 50 years. The capacity of animals to transport nutrients from biodiversity hotspots and spread them around the world has already declined by 92% on land and 96% in the oceans [1]. It’s hardly any wonder human beings are finding it harder and harder to find food.

We have to learn to share the space with animals, as only they can rebuild a habitable planet.

It should, in theory, be obvious to Gates that natural systems have already failed because the mass migration of animals, the transfer of nutrients and the creation of fertile soils and rich fisheries, have rapidly disappeared in recent years. However, it’s not obvious, because this part of Earth’s history is not widely acknowledged. Animals are still largely treated as a nicety rather than the mechanism for human life support, even among conservation biologists.

While climate change is certainly a consequence of burning fossil fuels, a worse situation awaits us, after we stop.

The processes that stabilise the climate, provide adequate drinking water and protect our food security are created by animals. Their movement across the planet, at all scales, is what makes them remarkable–it’s the trait that separates us from plants and it is their animal impact that we have to protect, if we’re to have a future of our own, on planet Earth. We have to learn to share the space with animals, as only they can rebuild a habitable planet.

We are beginning to see the breakdown of patterns of animal migration as a consequence of a rapidly warming ocean and atmosphere. Tuna are moving into new areas, shearwaters are altering their route to return to breeding grounds. But mostly, mass and forced migration involves human beings, where you’re seeing the symptom of famine and thirst (both of which a primers for war) caused by the breakdown of natural systems.

Does it make you wonder why we’re so affected? As animals get bigger and more sophisticated (and numerous), their effect on the surrounding environment increases. Larger species don’t last as long because their footprints on Earth, can be quite literally, bigger.

What if the mass migration of humans is a sign that our time is already up? If anything, the mass movement of people should have Gates concerned at the enormous destruction of the ecosystem through mass-extinction of animals. After all, we are animals and maybe this is a case of last in, first out? After all, humans didn’t appear until about 300,000 years ago. It was only long after wildlife had set up the right conditions of stability, that we had any chance of rising as a species on Earth.

  1. Doughty, C., et al., Global nutrient transport in a world of giants. Proceedings of the National Academy of Sciences of the United States of America, 2015. 113.

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