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Indispensable à la régulation du climat, au développement de la vie sur Terre, au maintien des écosystèmes, aux populations, au développement de l'agriculture, de l'industrie comme à la production d'énergie, l'eau est un élément vital. Il convient donc, dans un contexte de changement global, d'analyser dans toute sa diversité la place et le rôle de l'eau et de se donner ainsi les moyens de mieux la préserver. Autour de cet enjeu qui engage toute l'humanité, Agathe Euzen, Catherine Jeandel et Rémy Mosseri ont réuni près de cent cinquante contributions, visant à apporter un éclairage sur chacun des domaines et des approches que couvre cette thématique. Quelle est l'origine de l'eau ? Son rapport avec l'apparition de la vie ? Quel rôle a-t-elle joué dans l'histoire de la planète et dans le développement de la vie végétale, animale et humaine ? Quel est son cycle ? Quelles sont ses propriétés chimiques ? Comment les sociétés se sont-elles emparées de cet élément précieux ? Allons-nous manquer d'eau ? L'eau est-elle source de conflits ? Comment l'eau est-elle gérée ? Comment recycle-t-on une eau polluée ? Quels sont les risques pour la santé mondiale ? Quels sont les grands enjeux liés à l'eau au xxie siècle ? Comprendre et proposer des solutions à ces défis majeurs est l'intention de cet ouvrage.

Humanities, Multidisciplinary --- eau --- ressource naturelle --- biodiversité

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During the last hlO hundred years man has changed from living in equilibrium with the natural world which sustained him, to a new position in which he is now its undisputed ruler - and very often out of equilibrium - able in a matter of hours to reduce miles of forest to devastated, potential desert. This destructive and wasteful ability has increas~d dramatically over recent years. At the same time however the need for conservation, particularly of plants as a resource for the future, has also become apparent, along with the realisation that advanced technologies can produce more from existing agricultural and forest regions. This may to some extent relieve the heavy pressure on the vulnerable areas where short term over-exploitation leads to permanent destruction of whole ecosystems, and the attendant loss, for ever, of many of the animals and plants which originally lived there. There still remains today a vast number of plant species whose potential is unknown. Maybe they will never have more than aesthetic value to mankind. But who knows where, for example, the next anti­ cancer agent may be found. And anyway future generations may not be ready to accept such anthropocentric values, and the options should be kept open for the philosophical concept that all life on earth has a right to exist and that man has none to exterminate.

Plant conservation --- Botanical gardens --- Congresses. --- Congresses --- Ressource naturelle --- Ecosystème

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Ressource naturelle --- Natural resources --- Ressource en eau --- Water resources --- periodical --- Australia

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Natural resources --- environment --- resource management --- Community involvement --- world --- Ressources naturelles --- Gestion. --- Ressources naturelles - Gestion. --- Ressource naturelle

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In A Rough Ride to the Future, James Lovelock - the great scientific visionary of our age - presents a radical vision of humanity's future as the thinking brain of our Earth-system. This book introduces two new Lovelockian ideas. The first is that 300 years ago, when Thomas Newcomen invented the steam engine, he was unknowingly beginning what Lovelock calls 'accelerated evolution', a process which is bringing about change on our planet roughly a million times faster than Darwinian evolution. The second is that as part of this process, humanity has the capacity to become the intelligent part of Gaia, the self-regulating Earth system whose discovery Lovelock first announced nearly 50 years ago. In addition, Lovelock gives his reflections on how scientific advances are made, and his own remarkable life as a lone scientist. The contribution of human beings to our planet is, Lovelock contends, similar to that of the early photosynthesisers around 3.4 billion years ago, which made the Earth's atmosphere what it was until very recently. By our domination and our invention, we are now changing the atmosphere again. There is little that can be done about this, but instead of feeling guilty about it we should recognise what is happening, prepare for change, and ensure that we survive as a species so we can contribute to - perhaps even guide - the next evolution of Gaia. The road will be rough, but if we are smart enough life will continue on Earth in some form far into the future. Elected a Fellow of the Royal Society in 1974, JAMES LOVELOCK is the author of more than 200 scientific papers and the originator of the Gaia Hypothesis (now Gaia Theory). His many books on the subject include Gaia: A New Look at Life on Earth (1979), The Revenge of Gaia (2006), and The Vanishing Face of Gaia (2009). In 2003 he was made a Companion of Honour by Her Majesty the Queen, in 2005 Prospect magazine named him one of the world's top 100 public intellectuals, and in 2006 he received the Wollaston Medal, the highest Award of the UK Geological Society.

Cosmologie --- Ressource naturelle --- Environnement --- Géobiologie --- Geobiology --- Biosphere --- Gaia hypothesis --- Technological innovations --- Nature --- Evolution --- Earth sciences