Conférence Pugwash, Coeur de Sciences, Université de Québec à Montréal, le 6 février 2008
Par Derek Paul, Professeur émérite en physique, Université de Toronto; Cofondateur de Science et Paix
Déjà à la fin du 19me siècle, le CO2 a été reconnu comme gaz à effet de serre (GES) par Lord Rayleigh, qui avait mesuré le pourcentage de ce gaz dans l’atmosphère et avait estimé une augmentation de la température moyenne d’environs 6°C si l’on doublait la concentration qu’il avait mesurée.
Cent ans plus tard, les chercheurs en matière de science atmosphérique ont construit divers modèles complexes représentant l’atmosphère qui indiquent l’augmentation de la température, et la hausse du niveau des océans, selon un grand nombre de scénarios d’émissions GES.
Continue reading “Comment réduire au Canada les gaz à effets de serre écocides”
During my early September absence from the cottage on Lake Temiskaming, just north of Haileybury, the local beaver family had cut every poplar tree in sight on the property’s several acres. I surveyed the damage. It was too late to save the poplars, but still I wondered, “if only I could confront the beavers!” Continue reading “My First Conversation with a Beaver”
A paper prepared for the 53rd Pugwash Conference on Science and World Affairs
This paper examines values, and introduces a superordinate principle, the Principle of Life as a basis for a new paradigm. It looks at the major interrelated threats to human civilization: overpopulation; war and militarism; climate change; contamination pollution and waste; counterproductive myth, the world’s socio-economic system(s) and the phenomenon of overdeveloped male dominance. Attention to all these areas will be needed to avert a demographic catastrophe this century, or major war. The abolition of military establishments and of militarism, always desirable, is now seen to be essential. Since early 2002, the United States has announced four new projects and policy postures amounting to a declaration that it is now the ruler of an empire. International responses to the new situation have yet to be formulated, and they will need to be imaginative, peaceful, collective, determined, and preferably nonconfrontational. By contrast, the fact that the new empire has shown itself to be militarily undefeatable makes the response in terms of armament and disarmament different from the overall political response. Thus, unilateral disarmament by some nations makes more sense than it has done since warfare first began 6300 years ago. The more countries achieve general and complete disarmament unilaterally, the easier it will be for the others to follow suit. Application of the Principle of Life needs most to be developed for those areas that feature human-human interactions on a large scale – where it is currently least well understood how to apply it. Many important and vital changes can be deduced from it, through, for example, examining conditions that would prevent the recurrence of Third World debt following debt forgiveness. Profound changes will be needed so as to permit economic success in a world where industrial growth must of necessity come to an end. Economic growth can be allowed to continue, but it cannot be based on increasing extraction, manufacture and consumption, and paving over good agricultural land. In measuring economic growth, net domestic product rather than gross domestic product should be used as the financial indicator.
Continue reading “Surviving and Achieving Sustainability by Following a Fundamental Principle and asking the Right Questions”
La Physique au Canada juillet/août 1996 / Physics in Canada July/August 1996 by Derek Paul, Professor Emeritus, Physics Dept., University of Toronto, Toronto ON, M5S 1A7
Being 65 last year, I was obliged to bid a formal farewell to my good colleagues in June 1995 and adopt the cognomen Emeritus. But I felt no less a physicist as I entered my 43rd year in physics. At the formal farewell generously provided by my department I expressed several good wishes to those still in harness, and the hope that they would see their way to putting science back into context, which my generation has largely failed to do.
Continue reading “Physics and Philosophy”
published in Chapter 12, “Reactors in satellites”, in Nuclear Energy and Nuclear Weapon proliferation, ed. SIPRI (Taylor & Francis 1979)
At present the nuclear reactors in space are power generators designed to supply the electrical needs of instruments carried aboard the spacecraft. Although nuclear reactors could also be used as energy sources for propelling spacecraft, this second class of devices will not be discussed.
Continue reading “Nuclear Reactors in Satellites”