The carbon dioxide content in the earth’s atmosphere reached 419 ppm in May, the highest level in more than 4 million years
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The National Oceanic and Atmospheric Administration stated that humans add about 40 billion metric tons of carbon dioxide pollution to the atmosphere every year. If we To avoid catastrophic climate change, the top priority must be to reduce carbon dioxide pollution to zero as soon as possible. The May measurement is the monthly average of atmospheric data recorded by the National Oceanic and Atmospheric Administration and the Scripps Institute of Oceanography at an observatory on the top of Mauna Loa Volcano in Hawaii. The monthly average calculated by the National Oceanic and Atmospheric Administration of the United States from its measurement results is 419.13 ppm, and the average calculated by scientists from Scripps is 418.92 ppm. A year ago, the average was 417 ppm.
The National Oceanic and Atmospheric Administration of the United States stated that the atmosphere held a similar amount of carbon dioxide during the Pliocene period, about 4.1 million to 4.5 million years ago. At that time, the sea level was 78 feet higher. The average temperature of the earth is 7 degrees Fahrenheit, and there may have been a large area of forest growing on the Arctic tundra at that time. When Homo erectus, an early human ancestor, appeared about 2 million years ago, the earth’s temperature was even colder. At that time, the average level of carbon dioxide in the atmosphere was about 230 ppm, slightly higher than half of today’s level.
Carbon dioxide is a greenhouse gas that will stay in the atmosphere for hundreds of years. The dramatic increase in carbon dioxide in the last century was almost entirely driven by human activities, mainly the burning of fossil fuels. The impact of climate change has caused larger and more intense hurricanes, floods, heat waves and wildfires to regularly hit all over the world. Scientists say that in order to avoid more terrible situations in the future, countries must drastically reduce carbon dioxide and other greenhouse gas emissions.