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You're both right. What you're describing is only reenlavt in the context of sustainability that is, you're right as long as people and animals eat and use only sustainably produced foods, energy sources, and objects. Of course, energy is lost to heat no matter what. In nature, it is the sun that ultimately makes up for this, providing energy to plants, wind, the ocean, etc. The physical (non-energy) materials go back into the ground, air, or water, and are ultimately reused by other organisms or natural processes.In the consumerist/industrial world, we have broken many of the cycles of nature by using bits of nature in ways that are not sustainable. We burn things for energy, which is lost to heat and not reclaimed, nor is it replenished quickly enough through natural cycles beginning with the sun. We also turn materials into things that are not recyclable. In other words, they don't join the natural processes by which waste becomes useful for some other organism or process. Think of plastic artifacts. They don't biodegrade easily; we spend a lot of energy producing them, and when we throw them away they just sit in the ground, often unusable. We've removed them from any natural recycling process, and our artificial ones may make up for it, but not entirely. Think of burning energy for cars we extract the resource from the Earth at a much higher rate than it is replenished. The material goes into the air, where it is not useful for anything (and in fact pollutes) and the energy transports you, but just becomes heat that is released and un-reused ultimately. That's not sustainable.
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(VISITOR) AUTHOR'S NAME
Isaiah
MESSAGE TIMESTAMP
18 december 2014, 08:31:41
AUTHOR'S IP LOGGED
117.169.1.141
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