Rank three issues that you believe to be the most serious threats to our environment as a result of global warming, number one being the most serious. then, explain in paragraph form why you selected these three issues to be the most serious.

The most serious threat is the rising global temperatures changing climate patterns around the world. Hotter environments can mean more discomfort for people in the tropics, and certain plant and animals species that thrive in those environments may die out. This can cause disruptions in food chains and in the global food supply. A second threat is the rising sea levels due to the melting of glaciers. This can cause certain low-lying cities to become uninhabitable in the near future, if water rises to a point where they cannot be lived in. The likelihood of floods disrupting governments and economies is also increased. A third threat is ocean acidification. Because there is more CO2 in the atmosphere, more of it dissolves into seawater as well, and the increased acidity changes living conditions for marine plants and animals. This can also disrupt the ocean ecological system.

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

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