Global warming phenomenon (part one)

1. What is global warming?

The concept of global warming is no longer strange to all of us. Global warming is also known as global warming.

This is a phenomenon in which the average temperature of the Earth's air and oceans has increased according to observations over recent decades. During the 20th century, the average temperature of the air near the ground increased from 0.2 to 0.6 degrees Celsius.

Global warming has many effects and over time we can feel the effects of this phenomenon. There are 5 manifestations that are most clearly shown when the earth warms up.

The weather is changing and becoming increasingly harsh, which is clear evidence of global warming. The whole world is facing and struggling with extreme weather phenomena such as floods, droughts, heat waves and snowstorms.

In fact, we have had to endure more intense rainy seasons in the summer, more terrible snowstorms in the winter, and earthquakes, heat, and droughts that frequently occur and last longer.

According to statistics, sea levels are rising at an average rate of 1.8 mm/year over the past century. From 1993 to 2000, sea level rose about 2.9 - 3.4 ± 0.4 - 0.6 mm/year.

The phenomenon of rising sea levels is mainly due to thermal expansion, the warming atmosphere causes ice to melt. When the ice melts, a large amount of water will flow into the ocean and submerge some islands and lands that have existed for hundreds of years. If this situation continues, the islands and lands may no longer be on the map.

The melting of ice at the poles is a serious phenomenon that is happening every day, every hour. Through experimental research, the Arctic sea has warmed twice as fast as the global average. It shows that the area of the Arctic covered with ice each summer is gradually shrinking.

According to the US National Snow and Ice Data Center, as of September 16, 2012, the ice area in the Arctic was only 3.4 million square kilometers. In other words, Arctic sea ice has lost up to 80% of its volume at the present time.

The fourth manifestation of global warming is the continuous change in temperature in recent years. According to statistics, the first 10 years of the 21st century marked the largest temperature increase with the Earth's record heat ever.

According to estimates, average temperatures on land and sea water have increased by about 0.74 degrees Celsius worldwide over the past century. According to scientists from Oregon State University and Harvard University (USA), the earth's temperature has increased the highest in the past 11,000 years.

In particular, it may increase another 5 degrees Celsius within the next 100 years. This is an alarming thing, causing a significant impact on the life and development of the earth.

Finally, the worrying manifestation of global warming is the increased concentration of Carbon dioxide in the atmosphere. Through research and analysis of air bubbles in the ice of Antarctica and Greenland, scientists have concluded that, over the past 650,000 years, carbon dioxide (CO2) concentrations have ranged from 180 - 300 ppm.

Ppm is a unit of measurement to express concentration by mass and in parts per million. Analysis of isotopes of CO2 in the atmosphere shows that the increase in CO2 is a result of fossil fuel burning and forest burning.

They have nothing to do with natural processes. Therefore, this problem is caused by humans and we must quickly overcome them. As is known, Carbon dioxide is a greenhouse gas. It increases the greenhouse effect of the atmosphere and thus leads to global warming.