Bài luyện tập IELTS Reading topic Environment với dạng Multiple Choice và điền từ, giúp các bạn luyện kỹ năng hiệu quả. Cùng bắt đầu nhé.
More than a third of the world’s soil is endangered, according to a recent UN report. If we don’t slow the decline, all farmable soil could be gone in 60 years. Since soil grows 95% of our food, and sustains human life in other more surprising ways, that is a huge problem.Peter Groffman, from the Cary Institute of Ecosystem Studies in New York, points out that soil scientists have been warning about the degradation of the world’s soil for decades. At the same time, our understanding of its importance to humans has grown. A single gram of healthy soil might contain 100 million bacteria, as well as other microorganisms such as viruses and fungi, living amid decomposing plants and various minerals.That means soils do not just grow our food, but are the source of nearly all our existing antibiotics, and could be our best hope in the fight against antibiotic-resistant bacteria. Soil is also an ally against climate change: as microorganisms within soil digest dead animals and plants, they lock in their carbon content, holding three times the amount of carbon as does the entire atmosphere. Soils also store water, preventing flood damage: in the UK, damage to buildings, roads and bridges from floods caused by soil degradation costs £233 million every year.If the soil loses its ability to perform these functions, the human race could be in big trouble. The danger is not that the soil will disappear completely, but that the microorganisms that give it its special properties will be lost. And once this has happened, it may take the soil thousands of years to recover.Agriculture is by far the biggest problem. In the wild, when plants grow they remove nutrients from the soil, but then when the plants die and decay these nutrients are returned directly to the soil. Humans tend not to return unused parts of harvested crops directly to the soil to enrich it, meaning that the soil gradually becomes less fertile. In the past we developed strategies to get around the problem, such as regularly varying the types of crops grown, or leaving fields uncultivated for a season.
Complete the summary below.
Write ONE WORD ONLY from the passage for each answer.
Write your answers in boxes 5-8 on your answer sheet.
Why soil degradation could be a disaster for humans
Healthy soil contains a large variety of bacteria and other microorganisms, as well as plant remains and 5 ……………………….. It provides us with food and also with antibiotics, and its function in storing 6 …………………………. has a significant effect on the climate. In addition, it prevents damage to property and infrastructure because it holds 7……………………………
If these microorganisms are lost, soil may lose its special properties. The main factor contributing to soil degradation is the 8………………………….. carried out by humans.
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