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If H[omo] sapiens does not go extinct, the human population will decli — Environmentalism

"If H[omo] sapiens does not go extinct, the human population will decline drastically as we will be forced to return to making a living as hunter‐gatherers or simple horticulturalists. Also, the earth after the collapse of human civilization will be a very different place than the biosphere that supported the rise of civilization. There will be a long-lasting legacy of altered climate, landscapes, and biogeochemical cycles, depleted and dispersed stocks of fossil fuels, metals, and nuclear ores, and diminished biodiversity. The most powerful species in the 3.5-billion-year history of life has transformed the earth and left a mark that will endure long after its passing."
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Environmentalism
Environmentalism
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Environmentalism is a broad philosophy, ideology, and social movement about supporting life, habitats, and surroundings. While environmentalism focuses on the environmental and nature-related aspects of green ideology and politics, ecologism combines the ideology of social ecology and environmentalism. Ecologism is a term more commonly used in continental European languages, while environmentalism

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"This is a finite planet (though most seem to ignore that) and current resource extraction projects (also known as environmental destruction projects) won’t meet demand for minerals indefinitely. There is no indication that the world wants to stop expanding economic activity, or even just continuing existing activity (which will always require more mining without 100% recycling, which is impossible). So, eventually, the world economy would hit mineral limits and, therefore, will start to prioritise mining projects that were previously unthinkable."
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Environmentalism
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"History offers a mixed message about the capacity of humans to innovate and act in time to avoid collapse. At local and regional scales, many multiple past civilizations (e.g., Greece, Rome, Angkor Wat, Teotihuacan) failed to adapt to changing social and ecological conditions and crashed catastrophically. At the same time, human ingenuity and technological innovations allowed the global population and economy to grow at near-exponential rates. This growth has been fueled by exploiting new energy sources, transitioning among animal, hydro, wind, wood, coal, oil, natural gas, nuclear, photovoltaic solar, geothermal, and others. The implications of past localized collapses and global growth are of questionable relevance to the current situation, however, because now, for the first time in history, humanity is facing a global chemical energy limit. The earth-space battery paradigm provides a simple framework for understanding the historical effects of humans on the energy dynamics of the biosphere, including the unalterable thermodynamic boundaries that now pose severe challenges to the future of humankind. Living biomass is the energy capital that runs the biosphere and supports the human population and economy. There is an urgent need not only to halt the depletion of this biological capital but also to move as rapidly as possible toward an approximate equilibrium between NPP [net annual primary production] and respiration. There is simply no reserve tank of biomass for planet Earth. The laws of thermodynamics have no mercy. Equilibrium is inhospitable, sterile, and final."
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Environmentalism

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"If it fulfills our hopes, this center will be, at once, a symbol and a reflection and a hope. It will symbolize our belief that the world of creation and thought are at the core of all civilization. Only recently in the White House we helped commemorate the 400th anniversary of Shakespeare. The political conflicts and ambitions of his England are known to the scholar and to the specialist. But his plays will forever move men in every corner of the world. The leaders that he wrote about live far more vividly in his words than in the almost forgotten facts of their own rule. Our civilization, too, will largely survive in the works of our creation. There is a quality in art which speaks across the gulf dividing man from man and nation from nation, and century from century. That quality confirms the faith that our common hopes may be more enduring than our conflicting hostilities. Even now men of affairs are struggling to catch up with the insights of great art. The stakes may well be the survival of civilization. The personal preferences of men in government are not important--except to themselves. However, it is important to know that the opportunity we give to the arts is a measure of the quality of our civilization. It is important to be aware that artistic activity can enrich the life of our people, which really is the central object of Government. It is important that our material prosperity liberate and not confine the creative spirit."
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Lyndon B. Johnson
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"I did not go to join Kurtz there and then. I did not. I remained to dream the nightmare out to the end, and to show my loyalty to Kurtz once more. Destiny. My destiny! Droll thing life is — that mysterious arrangement of merciless logic for a futile purpose. The most you can hope from it is some knowledge of yourself — that comes too late — a crop of unextinguishable regrets. I have wrestled with death. It is the most unexciting contest you can imagine. It takes place in an impalpable grayness, with nothing underfoot, with nothing around, without spectators, without clamor, without glory, without the great desire of victory, without the great fear of defeat, in a sickly atmosphere of tepid skepticism, without much belief in your own right, and still less in that of your adversary. If such is the form of ultimate wisdom, then life is a greater riddle than some of us think it to be. I was within a hairs-breadth of the last opportunity for pronouncement, and I found with humiliation that probably I would have nothing to say. This is the reason why I affirm that Kurtz was a remarkable man. He had something to say. He said it. Since I had peeped over the edge myself, I understand better the meaning of his stare, that could not see the flame of the candle, but was wide enough to embrace the whole universe, piercing enough to penetrate all the hearts that beat in the darkness. He had summed up — he had judged. The horror! He was a remarkable man. After all, this was the expression of some sort of belief; it had candor, it had conviction, it had a vibrating note of revolt in its whisper, it had the appalling face of a glimpsed truth — the strange commingling of desire and hate."
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Heart of Darkness