For example, i’ve read somewhere that we need around 3,7Litres of water to produce a single cigarette and 2700Litres of water to produce a single t-shirt. Why do we need so much water to produce stuff?
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We need a lot of water to grow plants and plants are needed for those products. We also need a lot of water for many industrial processes.
This water is often rain water or underground water or river water that are not treated for human consumption. Those source of water are often plentiful, also a lot of water is rapidly returned where it came from. For example, many industrial processes will rapidly return the water, just a bit warmer, often cleaned up by filtration. Plants return the water by evaporation and the water will fall back in rain not to long after. Water is not exhausted by those processes.
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