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A koi pond should be able to stand-alone for hours without danger of quick suffocation or toxic waste build up.
Wind energy is infinite, pollution-free, and does not produce radioactive or toxic waste.
Non-renewable energy sources also use and pollute water supplies, harm plant and animal life, and increase toxic waste production.
Similarly, the game Toxic Waste seems simple enough.
Possible environmental factors, such as mercury exposure, lead poisoning, polluted water, living near toxic waste sites, have been studied.
