In the 1st Agricultural Revolution they went from hunting and foraging to settling down and making cities. Some of the effects were specialization and growing larger populations.
In the 2nd Agricultural Revolution they improved the way they harvested and stored. Some of the effects were help with population growth, cheaper food, and more food.
In the Green Revolution they used various means to increase production of grains. One of the positive effects was helped reduce world hunger and some of the negative effects was modified products used pesticides and fertelizer.
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