Examples of ecological disasters, what threats do ecological disasters pose to the survival of human

Tsunami, volcanic eruptions, flash floods, droughts, global warming, soil erosion.

Natural disasters, disruptions of the food chain, etc...

Ecological disasters pose the following threats to the survival of mankind:

1. Global warming has led to the dissolution of glaciers, causing sea levels to rise and reducing people's living space. According to relevant statistics**, global sea level will rise by about 20 cm by 2030 and 65 cm by the end of this century, seriously threatening low-lying islands and coastal zones.

2. Ozone layer depletion, the ozone layer is a gas layer with a high ozone concentration in the upper atmosphere, which can prevent too much solar ultraviolet rays from irradiating the earth's surface, effectively protecting the normal growth of all organisms on the ground.

The destruction of the ozone layer is mainly achieved by the chain reaction of the atomic chlorine produced by the decomposition of the chemical freon, which is widely used in modern life, into the stratosphere and decomposed under the action of ultraviolet rays.

3. Land degradation and desertification, land degradation and desertification refer to the process of land quality decline and gradual desertification due to the combined action of human factors such as human factors such as overgrazing, farming, indiscriminate reclamation and deforestation.

4. Waste material pollution and transfer, waste material pollution and transfer refers to the waste gas, waste liquid, solid waste, etc. discharged from industrial production and residents' lives to nature or to other countries, which seriously pollute the air, rivers, lakes, oceans, land environment and other problems.

5. Biodiversity reduction, biodiversity reduction refers to all biological species including plants, animals and microorganisms, due to the loss of the ecological environment, the overexploitation of resources, environmental pollution and the introduction of alien species, etc., so that these species continue to disappear, it is estimated that there are about 30 million species on the earth Since 1600, 724 species have become extinct.

1. The Arctic ice sheet is melting.

As the seasons change, the ice sheet melts and solidifies. But the disappearance of permafrost is a much longer process. The coastal lands of the polar regions are under threat due to a number of factors.

Rising global temperatures have melted mud-rich permafrost sediments, increased the intensity of ocean storms, washed sediments with waves, and caused floods that have eroded large swaths of land. In **, Alaska.

The vanishing coastline of the Bofort Sea shows the effects of climate change.

2. Chernobyl nuclear power plant.

**Divulge.

The largest nuclear catastrophe caused by humans occurred in Ukraine in 1968.

Chernobyl. At one o'clock in the morning of April 26, a reactor.

It happened. Along with the flames and nuclear leakage, 50 people died on the spot, and thousands of people developed cancer.

And after that, they all died.

The real catastrophe is unfolding in Chernobyl. The radiation spread far away, polluting the air, food, and groundwater, affecting locals for decades. Now the number of nuclear power plants in the United States is more than 60, and many have multiple reactors.

3. Brazilian Amazon rainforest.

It was cut down by humans and severely damaged.

Deforestation of the Brazilian Amazon rainforest has risen at an alarming rate over the past decade. Ranchers, ranchers and loggers destroy 10,088 square miles of rainforest each year, which is the size of Hampshire, England. More than 50% of the world's wildlife and 40% of the world's oxygen come from the Amazon.

4. Developed countries in developing countries.

Carry out industrial mining.

Both developed and developing countries rely on the mining of rare metals to boost their economies. But there can be a significant environmental cost. People dig pits above ground to extract the minerals they need, and soil erosion affects the surface and disrupts the ecological balance.

The ecology of the mining area is difficult to recover. For example, India's Sukendar Valley, which has 95% of India's chromite reserves, has turned it into one of the most polluted places in the world.

5. Overfishing.

The variety of fish that humans have eaten over the past two decades has actually declined. The rise in demand and the decline in ** have made bluefin tuna in the North Atlantic and Mediterranean regions.

and the North Atlantic cod is completely extinct.

The document documenting overfishing in 2009 was called "The End". In addition to the regret that fish can no longer be cooked, the rupture of the chain of important marine life will affect the survival of human beings. The health and continued development of the ocean is a major driver of the world's climate, and it is the foundation of both marine and terrestrial food**.

Ecological disaster refers to the disaster brought to society and human beings by the destruction of the balance of the ecosystem. For example, land desertification is caused by uncontrolled land reclamation and uncontrolled deforestation. The disaster that desertification brings to society and human beings is an ecological disaster.

For example, since mid-January 2008, the low-temperature, rain, snow and freezing weather that lasted for more than one month swept through most parts of southern China, and the forest ecosystem and wild animals and plants in many places suffered great damage, causing an ecological disaster.

Tornadoes, **, sandstorms, soil erosion, volcanic eruptions, mudslides, etc.

1. Ozone layer holes.

One of the most striking global ecological disasters is the hole in the ozone layer in the sky, which has become thinner and thinner due to the destruction of human activities, and the ozone layer prevents radiation from reaching the surface, and if the ozone layer continues to disappear, life on Earth will be lost. Scientists have pointed out that as long as the ozone layer changes by 1%, it could cause tens of millions of people to suffer from ** cancer within 10 years. In 2000, the Antarctic ozone layer had breached 28.3 million square kilometres, which was larger than three United States countries and had extended to the southern tip of South America.

Ozone holes are already being breached over the Arctic and will affect densely populated areas such as Western Europe, Northeast Asia and North America.

2. Terrorist pollution of the Rhine.

Let's take a look at a deliberate regional ecological disaster on the European continent - the terrorist pollution of the Rhine River. The German state television station ZDF has uncovered the culprit of the ecological disaster of the Rhine River in recent years, that is, the terrorist activities of the former Soviet Union's secret **. In 1986, large chemical plants, pharmaceutical factories and warehouses in Europe were attacked one after another, and highly toxic chemicals flowed into the Rhine, bringing a devastating disaster to the Rhine River, which flows through many countries, and dead fish piled up.

Even today, more than ten years later, the incidence of various strange diseases among nearby residents is much higher than that in other areas.

3. The Armas oil spill pollution incident.

An endemic ecological disaster that occurred unexpectedly in Taiwan's oceans - the Armas oil spill pollution incident. The Armas was grounded in the eastern waters of Hengchun Eluanbi, and about 1,100 tons of heavy oil and diesel fuel were leaked on board to pollute the waters and coasts of Eluanbi, and under the blowing of the northeast monsoon, the Longkeng Ecological Reserve in Kenting National Park bore the brunt, and the ecological resources such as coral reefs were seriously damaged. In the past 20 years, ecological disasters caused by oil pollution caused by ship crashes have emerged one after another around the world, which has had a fatal impact on the ecology, fisheries, and tourism.

Creating ecological disasters is not just the preserve of modern people. Historically, even in prehistoric times, many man-made ecological disasters have been observed. The ancient kingdom of Loulan, which flourished during the Han Dynasty in China, died due to desertification caused by overexploitation, which is a man-made ecological disaster recorded in history.

A science journal recently published that the large-scale extinction of prehistoric animals on various continents caused by the killing of wild animals by humans is a man-made ecological disaster in the prehistoric era.