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"Building Earth Archives" The Planet We Live in PPT Courseware 2
The top ten environmental problems that threaten human survival are:
(1) Global warming
Due to the increase in population and the increasing scale of human production activities, the release of carbon dioxide (CO2) and other greenhouse gases into the atmosphere continues to increase, leading to changes in the composition of the atmosphere. The quality of the air is affected and the climate is gradually warming. Due to global warming, there will be various impacts on the world. Higher temperatures can melt polar glaciers, and sea levels will rise by 6 centimeters every 10 years, which will cause some coastal areas to be submerged. Global warming may also affect changes in rainfall and atmospheric circulation, making the climate abnormal and prone to droughts and floods, all of which may lead to changes and damage to ecosystems.
(2) Depletion and destruction of the ozone layer
90% of the ozone gas on the earth is concentrated in the atmosphere 10 to 50 kilometers above the earth's surface. The ozone concentration is maximum at 25 kilometers above the ground, forming an ozone concentration layer with a thickness of about 3 mm, called the ozone layer. It absorbs ultraviolet rays from the sun to protect life on earth from excessive ultraviolet rays, and stores energy in the upper atmosphere to regulate the climate. But the ozone layer is a very fragile atmosphere. If some gases that destroy ozone enter, they will react chemically with ozone, and the ozone layer will be destroyed. The destruction of the ozone layer will increase the intensity of ultraviolet radiation on the ground, causing great harm to life on earth.
(3) Reduction in biodiversity
Biodiversity refers to a variety of organisms from all sources, including terrestrial, marine and other aquatic ecosystems and the ecological complexes they constitute; in the past century, due to the rapid increase in population and irrational development of resources by humans, , coupled with environmental pollution and other reasons, various organisms and their ecosystems on the earth have been greatly impacted, and biodiversity has also been greatly damaged. Relevant scholars estimate that at least 50,000 biological species become extinct in the world every year, with an average of 140 species extinct every day. It is estimated that by the beginning of the 21st century, the loss of wildlife worldwide will reach 15% to 30% of the total number.
(4) Spread of acid rain
Acid rain refers to rain, snow or other forms of precipitation with a pH value below 5.6 in atmospheric precipitation. This is a manifestation of air pollution. Acid rain has many impacts on the human environment. When acid rain falls into rivers and lakes, it will hinder the growth of fish and shrimp in the water, causing the fish and shrimp to decrease or become extinct. Acid rain also causes soil acidification, destroys soil nutrients, makes the soil depleted, harms the growth of plants, and causes crop yield reduction. Harm the growth of forests. In addition, acid rain also corrodes building materials. In the past decade or so, some monuments in acid rain areas, especially stone carvings, stone sculptures or copper statues, have been damaged more than in the previous century. There are currently three major acid rain areas in the world.
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"Building Earth Archives" The Planet We Live in PPT courseware:
"Building Earth Archives" The Planet We Live in PPT Courseware History of the Earth 1. Archaean Eon (4600--2500) 2. Proterozoic Eon (2500--540) 3. Phanerozoic Eon (5400) 1. Early Paleozoic Era (540- -408) is divided into Cambrian (540--495), Ordovician (495--438),...