Approximately 4 billion years, give or take a few million years. Since the beginning, the earth has gone through continuous warming and cooling periods. For instance, about 200 million years ago dinsoaurs were roaming around the jungles of Colorado. Global cooling might have been their downfall. More recently, glaciers covered most of Wisconsin about 700,000 years or so ago. Since then there have been as many as 10-12 glacial advances and retreats. The most recent major glacial advance peaked out about 20,000 years ago, then global warming set in and glaciers retreated for about 10,000 years after which there was a slight glacial advance. The earth warmed again and peaked around 5,000 years ago. The warming period since the last major glacial advance was when man started developing agriculture, and have more time to invent stuff. About 2000 years ago there was a minor glacial advance in some areas, then warming. About 500-600 years ago the "little ice age" began with cooling temps that lasted to the mid 1800's. Since then it has been warming except for a cool down from about 1940-1970 when some scientists thought we were going into another "ice age". Since the mid 70's things have been warming rapidly. This warming has been a great opportunity for some folks to blame all global warming on human activities. So far I don't think anyone really knows for sure, but whatever the cause, it could have profound effects on all life on earth, just as it always has.
The correct term is 'global warming'. It refers to the long-term increase in Earth's average surface temperature due to human activities like burning fossil fuels, deforestation, and industrial processes. 'Global warning' is not a recognized term in the context of climate change.
Global warming is an effect of climate change. Climate change refers to long-term changes in temperature, precipitation, and other atmospheric conditions. Global warming specifically refers to the increase in Earth's average surface temperature due to human activities like burning fossil fuels.
Global warming is happening and the earth is not cooling. It is warming. 2010 and 2005 tied as being the two hottest years on record, and the ten hottest years since 1800 have all been in the past fifteen years.
Global warming refers to the long-term increase in Earth's average surface temperature due to human activities that release greenhouse gases into the atmosphere, predominantly since the mid-20th century. The trend of global warming continues to be a significant environmental issue that requires immediate attention and action to mitigate its impacts.
There are no unpreventable causes of global warming. We could have prevented it, and we can still prevent the worst results if we act now.Change to renewable energyStop burning fossil fuels (coal, oil and natural gas)Replant the earth's forests.
The term is "global warming," which refers to the long-term increase in Earth's average surface temperature.
Scientists have long said that global warming is bound to interfere with snow and rainfall patterns, because air and sea temperatures and sea-level atmospheric pressure -- the underlying forces behind these patterns -- are already changing.
The main cause of current global warming is the increase in greenhouse gases in the atmosphere, primarily due to human activities such as burning fossil fuels and deforestation. Changes in Earth's orbit are natural and occur over long time scales, but they are not responsible for the rapid warming observed in recent decades.
The correct term is 'global warming'. It refers to the long-term increase in Earth's average surface temperature due to human activities like burning fossil fuels, deforestation, and industrial processes. 'Global warning' is not a recognized term in the context of climate change.
Global warming is when the global average annual temperature is generally trending upward. Global cooling is when it is trending downward.A:Global warming is happening now. Global warming is not beyond the control of mankind. It is being caused by our dependence on fossil fuels (coal, oil and natural gas) which we are burning to produce electricity.
Global warming is a long-term increase in Earth's overall temperature, which is occurring in all seasons. However, the effects of global warming, such as rising temperatures, melting ice caps, and more extreme weather events, can be more noticeable in certain seasons depending on the region.
Global warming is an effect of climate change. Climate change refers to long-term changes in temperature, precipitation, and other atmospheric conditions. Global warming specifically refers to the increase in Earth's average surface temperature due to human activities like burning fossil fuels.
The earth has a long history of warming and cooling. Ever heard of the Ice Ages? Other planets are currently showing evidence of warming.
Global warming is happening and the earth is not cooling. It is warming. 2010 and 2005 tied as being the two hottest years on record, and the ten hottest years since 1800 have all been in the past fifteen years.
We know now that global warming started in the Industrial Revolution, more than 200 years ago, when we discovered and started to burn fossil fuels, which released carbon dioxide (CO2). This is one of the greenhouse gases that are causing global warming.
Global Warming, that is the warming of the earth since the beginning of the Industrial Age, began when man discovered fossil fuels some 250 years ago. There were commercial coal mines in the US state of Virginia in 1740.
Global warming refers to the long-term increase in Earth's average surface temperature due to human activities that release greenhouse gases into the atmosphere, predominantly since the mid-20th century. The trend of global warming continues to be a significant environmental issue that requires immediate attention and action to mitigate its impacts.