Rainfall and Global Warming
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Re: Rainfall and Global Warming
"Hasn't Earth warmed and cooled naturally throughout history?"
"Yes. Earth has experienced cold periods (or “ice ages”) and warm periods (“interglacials”) on roughly 100,000-year cycles for at least the last 1 million years. The last of these ices ended around 20,000 years ago."
https://www.climate.gov/news-features/climate-qa/hasnt-earth-warmed-and-cooled-naturally-throughout-history
no conspiracy no doggy websites unless the governments own climate info is wrong
"Yes. Earth has experienced cold periods (or “ice ages”) and warm periods (“interglacials”) on roughly 100,000-year cycles for at least the last 1 million years. The last of these ices ended around 20,000 years ago."
https://www.climate.gov/news-features/climate-qa/hasnt-earth-warmed-and-cooled-naturally-throughout-history
no conspiracy no doggy websites unless the governments own climate info is wrong
Guest- Guest
Re: Rainfall and Global Warming
davsgold wrote:"Hasn't Earth warmed and cooled naturally throughout history?"
"Yes. Earth has experienced cold periods (or “ice ages”) and warm periods (“interglacials”) on roughly 100,000-year cycles for at least the last 1 million years. The last of these ices ended around 20,000 years ago."
https://www.climate.gov/news-features/climate-qa/hasnt-earth-warmed-and-cooled-naturally-throughout-history
no conspiracy no doggy websites unless the governments own climate info is wrong
Yes all of above is true but the key point is that the earth is warming much faster than at any time in the last 800,000 years. Eg much faster than when the world has has emerged from past ice ages .
planetcare- Contributor Plus
- Number of posts : 755
Registration date : 2019-09-27
Re: Rainfall and Global Warming
everything equals itself out, like people buying carbon credits from this spot to tear up another spot, taking money out of one pocket and putting it into the other won't change anything
below is from towards the end of the last link
"Over at least the past million years, glacial and interglacial cycles have been triggered by variations in how much sunlight reaches the Northern Hemisphere in the summer, which are driven by small variations in the geometry of Earth’s orbit around the Sun. But these fluctuations in sunlight aren’t enough on their own to bring about full-blown ice ages and interglacials. They trigger several feedback loops that amplify the original warming or cooling. During an interglacial,
sea ice and snow retreat, reducing the amount of sunlight the Earth reflects;
warming increases atmospheric water vapor, which is a powerful greenhouse gas;
permafrost thaws and decomposes, releasing more methane and carbon dioxide; and
the ocean warms and releases dissolved carbon dioxide, which traps even more heat.
These feedbacks amplify the initial warming until the Earth’s orbit goes through a phase during which the amount of Northern Hemisphere summer sunlight is minimized. Then these feedbacks operate in reverse, reinforcing the cooling trend."
below is from towards the end of the last link
"Over at least the past million years, glacial and interglacial cycles have been triggered by variations in how much sunlight reaches the Northern Hemisphere in the summer, which are driven by small variations in the geometry of Earth’s orbit around the Sun. But these fluctuations in sunlight aren’t enough on their own to bring about full-blown ice ages and interglacials. They trigger several feedback loops that amplify the original warming or cooling. During an interglacial,
sea ice and snow retreat, reducing the amount of sunlight the Earth reflects;
warming increases atmospheric water vapor, which is a powerful greenhouse gas;
permafrost thaws and decomposes, releasing more methane and carbon dioxide; and
the ocean warms and releases dissolved carbon dioxide, which traps even more heat.
These feedbacks amplify the initial warming until the Earth’s orbit goes through a phase during which the amount of Northern Hemisphere summer sunlight is minimized. Then these feedbacks operate in reverse, reinforcing the cooling trend."
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