Earth is only living planet known to mankind. Since Earth's inception, Earth's long evolution has shaped a unique distribution of oceans and land, and various ecosystems have developed on its surface. Humans have evolved to be current masters of earth. Although humans can launch rockets into space and fly from earth to land on surface of moon, it can be said that earth is still only home of mankind.
But in long-term development of mankind, Earth is suffering from various crises caused by human development, as human activities lead to a rapid increase in concentration of greenhouse gases in Earth's atmosphere, current concentration of amount of carbon dioxide in Earth has reached millions in 2019, which is considered to be is cause of global warming and climate change. According to observations, over past 4 years from 2015 to 2018, Earth experienced four of hottest years on record for human observations. If global warming continues at its current pace, temperatures could rise by 3-3% by end of this century by 5 degrees Celsius, which means warmer and more extreme climate of Earth. The warming of earth has led to frequent extreme weather events, and heavy rains, floods, droughts and hurricanes have often been in spotlight in recent years.
In addition to climate extremes caused by global warming, human activities and climate change also threaten planet's ecosystems. Many strange creatures used to live in different regions of earth, but due to various reasons such as human activities, climate change and invasion of alien species, many species have said goodbye to humans, such as well-known dodo. and great auk, American passenger pigeon, thylacine, etc., but there are still many unknown species that have quietly disappeared from face of earth. According to statistics, there are currently more than 27,000 endangered species in world.
During development of modern age, people take too much from land, which has led to overexploitation of some areas of land. For example, land loses an average of over 200 square kilometers of forest. area every day, and Amazon rainforests in South America are being destroyed, many primitive rainforests have been razed to ground. And some lakes have shrunk significantly or even nearly disappeared due to increased water use from human activities, such as former Great Lakes of Central Asia and Aral Sea, world's fourth largest lake, have shrunk by 90% after a decade of overexploitation and have almost completely dried up.
The destruction of natural environment by humans is also surprising. All kinds of pollution and waste have become very serious environmental problems. For example, marine plastic pollution has become a hot topic for global attention. It is estimated that 8 million pieces of garbage enter ocean every day. In 2015, there were about 50 million tons of marine plastic waste in world. Researchers predict that plastic pollution will triple again to 150 million tons in 2025, which is quite predictable. matter. Much of it has turned into a large amount of plastic particles less than 5 mm in size, which are considered harmful to marine life and human health.
Different situations show that current state of Earth is not good, but all changes on Earth are about you and me. April 22, 2019 - Earth Day. As state of Earth's environment deteriorates, and global ecological and environmental crisis gradually worsens Today, experts from many countries issued a warning: man needs to take more care of nature and protect the only homeland of man from complete destruction.