Nature and ancient civilizations

Last night, I came across an article about Indus Valley civilization, and I wondered why those people deserted their homes. After exploring a bit, I discovered something unsettling yet intriguing: Climate change may have been the cause of the demise of many civilizations. On Internet, I found examples of destroyed cultures which might have been affected by climate change. Some of these are, the Maya civilization: This civilization, which began in 2600 BC, is notable for being the cultural hub of Mesoamerica. Here, a "megadrought" took place between 800 and 1000CE. Researchers have found that severe drought occurred during this time, leading to abandonment. Indus Valley Civilization: Also known as the Harappan Civilization, is famous for its urban areas and water storage technology. Researchers believe that around 2000BCE, massive droughts caused a severe population fall. Angkor Civilization: Around 1100 and 1200 CE, the vast pre-industrial metropolis of Angkor was founded in Cambodia. The region had some of its most violent monsoons between 1300 and 1400 CE. Droughts hampered food production, while floods caused the collapse of canals and reservoirs. Many scholars think that the lack of food and water caused this civilization to fall. Our civilization will face many challenges. But, we should consider doing something on an individual level. Some of the things are minimizing waste, repairing and reusing things, not wasting food and even talking to others.