The settlement of humans came after the time of hunter and gatherers, who typically moved a lot and changed their living place. This life-style (moving a lot) meant that nature could compensate for what people took: the food they collected could grow back and the animals they killed to eat could re-populate the are.
The settlement of humans meant that nature could no longer replenish itself and that the human impact on nature became long-lasting
Answer: Because more and more agriculture is one of the main "professions", where the use of water is extremely essential. Therefore, there is a great demand for it due to the scarcity that it has been having, since this is a renewable medium.
Because of Dhaka's position below sea level the city experiences yearly flooding, particularly around the monsoon seasons and has the constant threat of rising sea levels, which would of course cause more flooding.
