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Humans figured out ways to use stone tools to have a more proficient way of hunting. This is apart of threshold number 6 ,collective learning, because people have to share ideas with each other to make tools.

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Humans used fire to cook,light dark places, and warmth.  This is also apart of threshold six because they had to learn to use fire, which would mean it was collective learning.

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7) Humans domesticate animals for energy

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7) Humans domesticate animals for energy

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Humans domesticated animals for many reasons such as carrying cargo loads, transportation, and agriculture.  Unlike the two before this is apart of threshold 7, agriculture, because domesticated animals were mainly used for agriculture.

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Humans used Coal and steam for steam engines. This is apart of threshold 7 and 8 because it was used in 7 and continues on through 8. A negative for this use of energy would be using fossil fuels which means coal will eventually run out. A positive would be it is relied on a lot by the USA and the UK. Another negative would be it's hard to mine and it pollutes the air.

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9) Humans Use Natural Gas & Petroleum (Oil) For Energy

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9) Humans Use Natural Gas & Petroleum (Oil) For Energy

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Humans found a way to use  natural gas and petroleum (oil) for energy, which are now apart of  threshold 8 when our modern society started to form because of new energy resources. A positive of this is that it is a good on-the-go fuel, but it is finite and expensive.

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Nuclear power that humans learned to control was from nuclear reactions that released nuclear power that was then converted to electric power. This is considered threshold 8, because it involves a new energy resource like number 9. A positive of this type of energy is that it is cheap and easily controllable. A negative is that it also creates hazardous waste.

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11) Humans Use Sustainable Power For Energy

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11) Humans Use Sustainable Power For Energy

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Humans had to use just the right amount of power to make energy his takes place in threshold 8 because it is a new goldilocks condition in a way for threshold 8. A positive effect of the sustainable power is that it provides threats to breakdown.