how do human beings modify this natural environment??
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Answer:
For thousands of years, humans have modified the physical environment by clearing land for agriculture or damming streams to store and divert water. ... While these modifications directly impact the local environment, they also impact environments farther away due to the interconnectivity of Earth's systems.
Answer:
Although, recently we have been able to accomplish it with fewer people, faster.
The two principle tools for modifying an environment are some of the oldest tools in existence: the shovel and the axe.
If there a forest where you don’t want one? Take an axe and start cutting down trees. It will take one person a VERY long time to erase a forest, but over a lifetime it can be done. Or, a large team of people can do it much more quickly. One person with a chainsaw can do it quicker than a person with an axe, and a team of people with chainsaws can do it even quicker than that. But one person with one axe can still get the job done.
Is there not a forest where you want one to be? Humans can accomplish that also, without any tools at all. Just take a lot of tree seeds, and use your fingers to push each one into the ground.
With a shovel humans can turn hills into plains, or even into valleys. With a shovel humans can turn valleys into plains, or even into hills. Just like axes, more humans with shovels can do the job faster. Powered earth-moving equipment can do the job even faster than that.
We can dig new courses for rivers, directing them wherever we want them to go. It just involves digging.
Or, consider the fate of Ellicot City, Maryland. Downtown Ellicot City is in a valley next to a big hill. For a very long time, this worked fine. Recently, however, that valley has been subject to massive flooding repeatedly. This is because that hill used to be absorbent. When rain would fall, it would soak into the ground. Recently, however, a subdivision was developed on that hill, with lots of concrete and black-top, not to mention the impervious roves of the houses. Now, when rain falls, it runs off of that hill and down into the valley, causing flooding.
Human activity modified that environment, and now a part-time river exists where one did not previously. That river runs right down Main Street, destroying all the businesses which make it a cool place to be