Homo??

Julian Cribb* -- The Case for Re-naming the Human Race

Julian Cribb

This opinion piece is reprinted with the permission of www.sciencealert.com.au and the author.

An abbreviated version appeared as "correspondence" in Nature 476, 282 (18 August 2011) doi:10.1038/476282b.

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It is time the human race had a new name.  The old one, Homo sapiens – wise or thinking man – has been around since 1758 and is no longer a fitting description for the creature we have become.

When the Swedish father of taxonomy Carl Linnaeus first bestowed it _[i], humanity no doubt seemed wise when compared with what scientists of the day knew about both humans and other animals. We have since learned our behaviour is not as wise as we like to imagine – while some animals are quite intelligent. In short it is a name which is both inaccurate and which promotes a dangerous self-delusion.

In a letter to the scientific journal Nature (476, Aug 18, 2011) I have proposed there should be a worldwide discussion about the formal reclassification of humanity, involving both scientists and the public. The new name should reflect more truthfully the attributes and characteristics of the modern 21^st century human – which are markedly different from those of 18^th century ‘man’. Consider, for example, the following.

Humans are presently engaged in the greatest act of extermination of other species by a single species, probably since life on Earth began. We are destroying an estimated 30,000 species a year - a scale comparable to the great geological catastrophes of the past._[ii]

We currently contaminate the atmosphere with 30 billion tonnes of carbon equivalent a year._[iii] This risks an episode of accelerated planetary warming reaching 4-5 degrees by the end of this century and 8 degree by the middle of next century – a level at which food production would be severely disrupted, posing a serious risk to all members of an enlarged human population._[iv]

We have manufactured around 83,000 synthetic chemicals _[v], many of them toxic, and some of which we inhale, ingest in food or water or absorb through the skin every day of our lives. A 2005 US study found newborn babies in that country are typically contaminated by around 200 industrial chemicals, including pesticides, dioxins and flame retardants _[vi]. An EU study (2010) found compelling evidence that even harmless chemicals can recombine with one another to form poisons._[vii]  These chemicals are now found all over the planet, even at the poles and in the deep oceans and new ones, of unknown hazard, are being produced all the time. Yet we wonder at the rise in cancers and ‘mystery’ illnesses.

Every year we release around 121 million tonnes of nitrogen, 10 million tonnes of phosphorus and 10 billion tonnes of CO₂ (which causes acidification) into our rivers, lakes and oceans – many times more that the Earth recirculates naturally.  This is causing the collapse of marine and aquatic ecosystems, disrupting ocean food chains and replacing them with ‘dead zones’ that no longer support life. The number of these found has risen to over 400 in recent years. _[viii]

We are presently losing about one per cent of the world’s farming and grazing land every year to a combination of erosion, degradation, urban sprawl, mining, pollution and sea level rise._[ix]  The situation has deteriorated in the last 30 years, confronting us with the challenge of doubling food production by 2060 off a fraction of remaining land. At the same time we waste a third of the world’s food. _[x]

Credit: Nature / S. Harris

Current freshwater demand from agriculture, cities and energy use is on track to double by mid century, while resources in most countries – especially of groundwater – are drying up or becoming so polluted they are unusable._[xi]

Humanity passed peak fish in 2004_[xii], peak oil in 2006 _[xiii] and is likely to encounter growing scarcities of other primary resources, including mineral nutrients, in coming decades. Yet our demand for all resources – including minerals, energy and water – will more than double, especially in Asia. If all the world were to live like contemporary Australians or Americans, it would require four planet Earths to satisfy their wants, says the Global Footprint Network._[xiv]

Humans invest $1.6 trillion a year in new weapons _[xv] – but only $50 billion a year in better ways to produce food. Despite progress in arms reduction, the world still has around 20,000 nuclear warheads and at least 19 countries now have access to them or to the technology to make them _[xvi]

Finally, we are in the process of destroying a great many things which are real – soil, water, energy, resources, other species, our health – for the sake of something that exists chiefly  in our imagination: money.  To trade something real for something  imaginary hardly appears wise.

Finally, as growing number of eminent scientists are now saying, these things carry the risk of catastrophic changes to the Earth’s systems, deleterious not only to our own future but that of all life.

When these issues are considered, it is difficult to justify a single epithet of ‘wise’, let alone two of them. Our official sub-species name is Homo sapiens sapiens (‘wise wise man’), which now looks not only like conceit – but insecurity. Such a name sends a misleading signal about the capacity – let alone the will – of humanity, as a whole, to manage the consequences of its own actions. It invites us to overestimate our abilities and underestimate the difficulties we are creating.

This is not to deny or belittle any of the great, creative, artistic or scientific achievements of humans today or over the centuries, which are indeed wonderful._[xvii] Rather it is to recognise that our present behaviours combined with our numbers now have the capacity to nullify or even eliminate all other human accomplishments.

The human population is currently on track to reach 10 billion or more by the end of the century_[xviii] and this is a primary concern. An even greater one is our ungovernable appetite – for food, for material resources, for energy, for water, for land – and our lack of wisdom when it comes to managing and reusing these resources._[xix]

A creature unable to master its own demands cannot be said to merit the descriptor ‘wise’. A creature which takes little account of the growing risks it runs through its behaviour can hardly be rated thoughtful. The provisions of the International Code on Zoological Nomenclature provide for the re-naming of species in cases where scientific understanding of the species changes, or where it is necessary to correct an earlier error. I argue that both those situations now apply.

However this is not merely an issue for science: it concerns every one of us. There needs to be worldwide public discussion about an appropriate name for our species, in the light of our present behaviour and attributes.

Further down the track I would not rule out an eventual return to the name Homo sapiens, provided we can demonstrate that we have earned it – and it is not mere flatulence, conceit or self-delusion.

Two years ago another Swedish scientist, Johan Rockstrom and his international colleagues (including Australians Will Steffen and Terry Hughes) identified 10 planetary ‘boundaries’ which we ought not to transgress because of the damage it will cause to our world and our chances of surviving in it._[xx] They found we had already crossed three. These boundaries can be used as a report card on the human race: our success in remaining within them will be a direct measure of our wisdom - and of our determination to survive both as a species and a civilisation.

The wisdom to understand our real impact on the Earth and all life is the one we most need at this point in our history, in order to limit it.