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originally posted by: ScepticScot
originally posted by: network dude
a reply to: ScepticScot
I'd have to ask then, what caused the severity of storms in the 1800's? There were a few of them, and they were certainly quite aggressive.
The climate scientists, the same ones who say things like what you mentioned, have been saying that AGW will cause more hurricanes and stronger storms. Yet, that doesn't seem to be the case.
It’s been nearly 12 years, or 4,253 days, since the last major hurricane made landfall in the U.S., which is the longest such period on record.
link to source
There are a lot of factors that affect frequency and severity of storms. Climate change is just one which may or may not have a significant impact on any given storm.
Land fall of 1 category of storm in a relatively short time period is a poor way of understanding the impact. My understanding is that there is some evidence of increased frequency and increased severity but over a fairly short time period due to variance in historical records.
The position of mist climatologists I believe is that it will have an impact as global warming continues but that we are relatively early in this process.
originally posted by: Flavian
a reply to: ScepticScot
This is certainly an argument with respect to this particular storm in terms of increased moisture in the atmosphere leads to a greater rainfall than expected.
When you consider the amount of rain that has fallen in Texas you can't simply dismiss this argument - which is of course not the same as saying climate change causes hurricanes (which would be nonsense).
Hurricanes are intense low pressure areas that form over warm ocean waters in the summer and early fall. Their source of energy is water vapor which is evaporated from the ocean surface.
Water vapor is the "fuel" for the hurricanes because it releases the "latent heat of condensation" when it condenses to form clouds and rain, warming the surrounding air. (This heat energy was absorbed by the water vapor when it was evaporated from the warm ocean surface, cooling the ocean in the process.) - NASA
It’s been nearly 12 years, or 4,253 days, since the last major hurricane made landfall in the U.S., which is the longest such period on record. On a global level, accumulated cyclone energy is at its lowest level on record, according to Colorado State University hurricane expert Philip Klotzbach.
You can't really compare storms from the 1800s in that many areas were new to mass settlement. In simple terms, people at that stage didn't know where was safer to build, etc. They also didn't have long range weather forecasts, satellite data and the like. These factors all lead to greater damage and loss of life.
originally posted by: zikzak
CO2 will likely rise to 435 ppm in another decade. That's 55% increase since pre industrial warm era peak of 280 ppm. Warm era peak 280 ppm is 55% increase over glacial era peak of 180 ppm.
Deforestation is the permanent destruction of forests in order to make the land available for other uses. An estimated 18 million acres (7.3 million hectares) of forest, which is roughly the size of the country of Panama, are lost each year, according to the United Nations' Food and Agriculture Organization (FAO).