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How do you exactly explain global warming?
Global warming is directly tied to CO2 in the atmosphere, correct?, And over the years there has been a steady increase in CO2, correct?, Then how do you explain the sudden drop in temperature in the mid 1900's, or the mini ice age in the 1000's? What about the scientific fact that heat creates CO2 and CO2 doesn't create heat? Don't be mean. It's just a question.
Hi Alex,
I'll go through the points you raised one by one and see if I can shed some light on your questions...
"Global warming is directly tied to CO2 in the atmosphere, correct?"
Correct. CO2 isn't the only greenhouse gas and it's not only greenhouse gases that are responsible for global warming. Methane, nitrous oxide and dichlorodiflouromethane are the other primary greenhouse gases.
"And over the years there has been a steady increase in CO2, correct"
Yes there has. We have atmospheric CO2 records stretching back 650,000 years and during that time levels varied between 190 and 310 parts per million by volume. For thousands of years up until about 1800 levels had been at 280 ppmv give or take 3. Since then amounts have risen to their current level of 385 ppms.
"Then how do you explain the sudden drop in temperature in the mid 1900's"
Temperatures fell in the mid 1900's (primarily in the 1940's) by about 0.22°C. Back then the atmosphere was heavily polluted with gases such as sulphur dioxide (SO2). This is a gas which out sunlight and one scheme currently being considered to mitigate global warming involves creating a 'sulphur blanket' around the planet. By the mid 1900's air pollution was a huge issue which came to a head with the London Smog in which hundreds of people a day were dying in London alone. Governments acted and passed Clean Air Acts forcing industry to reduce pollution. As pollution levels declined so too did the barrier against sunlight.
"or the mini ice age in the 1000's"
The mini ice age wasn't a global event, it affected Europe more than other places and the northern hemisphere more than the southern. It is probable that there are three contributory factors: The Black Death in Europe killed approximately half the population and as a result there was a significant decline in agricultutal activities (one of the main causes of greenhouse gases), at the same time there was a period of intense volcanic activity which poured immense quantities of volcanic ash and dust into the atmosphere which blocked out sunlight. We saw this most recently following the 1991 eruption of Mount Pinatubo when global temperatures fell by 0.6°C. A third contributory factor was something called the Maunder Minimum - a period of virtually no sunspot activity at all, at such times the heat energy from the sun decreases slightly.
"What about the scientific fact that heat creates CO2 and CO2 doesn't create heat"
Heat is a form of energy and energy can neither be created nor destroyed (the law of Conservation of Energy). Heat energy can be applied to a material causing it to release / produce CO2 and the burning of fossil fuels is a good example of this (it's not heat that's creating CO2 but a chemical reaction between carbon and oxygen).
Perhaps you're referring to the fact that in the past temperatures have risen prior to rises in CO2 levels. This is to be expected, as part of a Feedback Effect. Rising temperatures result in rising levels of carbon dioxide but it also works the other way round. In nature it's rising temperatures that trigger the cycle, a cycle which occurs over long periods of time. If there was some natural event that quickly produced large quantities of CO2 we'd have seen subsequent rises in temperatures but such events don't occur in nature.
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