When drinking water is stored in containers, a thin layer of microorganisms can grow at the interface of the container and water.
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When drinking water is stored in containers, a thin layer of microorganisms can grow at the interface of the container and water.
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Over the last decade we have become increasingly alarmed at the amount of plastic in our oceans. More than 8 million tons of it ends up in the ocean every year. If we continue to pollute at this rate, there will be more plastic than fish in the ocean by 2050.
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People have relied on buried reservoirs of clean, life-giving water for thousands of years. But there are limits to how much can be sucked out of the ground before the wells run dry – or other unpredictable problems emerge.
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Built in the 1950s to generate electricity, Lake Kariba in Zambia and Zimbabwe has since supported activities such as tourism, fishing and conservation.
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Most people would agree that invasive plants are unwanted.
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