4 Most of the warming occurred in the past 35 years, with the five warmest years on record taking place since 2010. . Global warming is going to get worse with time, and there are many researchers who are spending most of their time looking into this when it comes to their work. A new study suggests it could have been decades earlier than we had thought. Most scientists agree that man-made climate change, or global warming, ... a Swedish chemist, saw the possibility for global climate change, they were dismissed as being alarmists. Until now, scientists believed that climate change started in the late 1800s. However, there was “the Late Glacial Maximum (ca. Global warming skeptics claim that 20th-century temperature changes followed from solar influences. They want to get a read on what is happening around the planet, and it starts here. (The solar-climate correlation would fail in the following decade.) “The Last Glacial Maximum (LGM) refers to a period in the Earth’s climate history when ice sheets were at their maximum extension, between 26,500 and 19,000–20,000 years ago, marking the peak of the last glacial period.” As such, one could argue that Global Warming began about “19,000–20,000 years ago”. How Did Global Warming Start? Beginning in the late 1950s, scientists observed a steady increase in carbon dioxide in the atmosphere based on precise measurements. => Solar variation Geologists discover massive extinction event 55 million years ago, associated with tremendous warming caused by increase in greenhouse gases.

When did manmade global warming begin? The planet's average surface temperature has risen about 1.62 degrees Fahrenheit (0.9 degrees Celsius) since the late 19th century, a change driven largely by increased carbon dioxide and other human-made emissions into the atmosphere.

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