The American Indian groups or Native Americans had no idea of money and no economies, not until the European immigrants introduced it to them. Even though a lot of time has passed when they were introduced to the ideas of economy and money, a lot of them declined the use of money as they believed that money is evil in nature.
Its because of people burning fossil fuels and causing pollution.
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Answer: positive reinforcement
Explanation:
Positive reinforcement when someone has done something good in order to encourage them further a particular positive stimulus is given to that person .
This introduced stimulus increases that behaviour in such that the person will be more likely to continue doing it all over again .
Most parents use this strategy to reinforce positive behaviour in their children as this intensifies the great behaviour that has already been started.
Words i believe hope this helps