The Vostok Ice Core data would indicate that events of global warming began over 400,000 years ago. It is most likely that global warming events occurred millions of years before and followed by global cooling that led to the formation of ice.
Data indicates there have been over 75 major global temperature swings in just the last 5,000 years.
Answer:
The last ice age began about 110,000 years ago, and ended 12 to 15 thousand years ago. The maximum ice extent occurred about 22,000 years ago. Therefore, the previous ice age warming began roughly 22,000 years ago. Although the age had lasted a long time, like previous ice ages once it began to thaw a feedback mechanism kicked in making the temperature rise quickly.
So for natural global warming the answer would be 22,000 years ago. That ice age, like previous ages, was caused by orbital variations. Currently earth is closest to the sun in January, making northern hemisphere winters (where most of the land mass resides) slightly warmer. When the dead of winter occurs at aphelion, winters tend to be colder. This is one cycle. There are other, longer natural climate cycles.
The current Milankovitch Cycle (as these orbital cycles are known) indicates earth should have entered a slight gradual cooling phase some centuries ago, culminating with the onset of another ice age in another 50,000 years. Instead, earth's temperature has been climbing rather dramatically, in response to significantly increased greenhouse gas emissions from human activity.
The accompanying temperature chart shows the most significant part of the recent upswing took effect beginning in the 1970s (see links).
No, chlorine has no effect on Global Warming.
The greenhouse effect is primarily responsible for global warming. This process involves the trapping of heat in the Earth's atmosphere by greenhouse gases such as carbon dioxide and methane, leading to a rise in global temperatures. Human activities, particularly the burning of fossil fuels and deforestation, have significantly increased the concentration of these gases, intensifying the greenhouse effect and contributing to global warming.
No, helium is not a cause of global warming. Helium is an inert gas and does not react with other substances in the atmosphere to contribute to the greenhouse effect.
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An enhanced (or accelerated) greenhouse effect which is causing global warming.
No, chlorine has no effect on Global Warming.
the green house effect called global warming,and the global warming is increasing day-by-day.
No the warming is only a warming of the atmosphere.
No, Global warming has no effect on volcanoes. It's the other way round. Volcanoes can increase global warming slightly if the emit carbon dioxide. And they can reduce global warming for a while if their dust and ash block out and reflect the sun's rays.
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Greenhouse gases (carbon dioxide and methane, mostly) cause global warming by increasing their levels in the atmosphere. This turns the benign greenhouse effect into an accelerated greenhouse effect which is causing global warming.
Global Warming is coming to earth. It is because of ozone depletion.
The effects on global warming on the bioshere are snow everywhere and cold days... we might even freeze to death... global warming is so COLD.
Yes, the enhanced, or accelerated greenhouse effect, is causing global warming, which is causing climate change.
Global warming is the increase of greenhouse gases. It causes various problems including ozone depletion.
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