Why earth is called dynamic planet
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Earth is a Dynamic Planet
Change is perhaps the only constant in our planet's history. Since the Earth's beginning about 4.5 billion years ago, natural climate and environmental conditions on our planet have been in constant flux. Solar variability, volcanic eruptions, meteor impacts, the emergence of life, the formation of an atmosphere rich in oxygen and greenhouse gases, changing ocean circulation patterns, wildfires—over the millennia these and other geological forces shaped an intricately intertwined global climate system that we are only just beginning to understand.
Ross Sea Iceberg
The Earth is changing constantly at scales ranging from snowflakes to continents. In the Spring of 2000, an iceberg twice the size of the state of Delaware broke from the Ross Ice Shelf in Antarctica. The Moderate-resolution Imaging Spectroradiometer (MODIS) took this image on March 20, 2000. (Image courtesy MODIS Atmospheres Team, NASA GSFC)
Fast forward to the late 1800s and witness the arrival of a new and profound force for change—humankind's Industrial Revolution. The Industrial Revolution not only ushered in a new era of prosperity for many, it also gave us the tools to dramatically reshape our environment. But the impact we are having on our environment appears to have set the wheels of climate change in motion at a rate not seen on Earth for millions of years. Over the last 100 years, the human population has tripled. In that time, we consumed fossil fuels in increasing amounts to feed our rapidly industrializing economies, raising atmospheric carbon dioxide levels by 25 percent. We burned away forests to make room for our cities and roads, releasing carbon dioxide as well as eliminating trees that would otherwise be absorbing some of the gas back out of the air during photosynthesis. Over the last three decades, humans burned an average of 75 million acres of forestland every year. We introduced chlorofluorocarbons into the air that destroy ozone in the stratosphere. Without its stratospheric ozone shield, the surface of our world would be exposed to the sun's harmful ultraviolet rays, and life as we know it couldn't exist. Due, at least in part, to the rising levels of carbon dioxide, the average global temperature has risen 0.5°C over the last century, and some computer models predict it could rise another 1°C over the next century. Already we see the polar ice caps melting at an alarming rate, while an average of two to three glaciers disappear worldwide every week. Geologists speculate that the U.S. Glacier National Park will contain no glaciers by the year 2050.
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