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This. Grandparent shouldn't have been modded up.
Earth's sustainable population using current tech is somewhere between 9 and 12 billion. People are only going hungry for political reasons. There's plenty of food, it just doesn't get to those who need it. As to energy, there's not enough resources readily available for everyone to live at U.S. levels, which are frankly a bit wasteful; but, it is possible to pull everyone up to a similar standard of living, in time.
Affects of wind turbines on the atmosphere have been studied. Of course they have a localized effect. Short version is the turbines cause local mixing of higher altitude and ground level air, resulting in minor changes to local weather down-wind. The mixing and turbulence will affect pollen and dust in different ways, depending on particle size and where they were (high/low) to begin with. Overall you're pulling heat out of the atmosphere; so, not a bad thing. Turbine numbers would have to get truly massive in order for them to have any significant global effect.
In science, if you're having to make exceptions to fit the rule to nature, then the rule doesn't make sense.
That's the general idea. You have to add all the objects that meet the criteria. The current criteria does not depend on characteristics of the object itself; the definition includes characteristics of the surrounding objects as well. I tend to agree with the argument that the current definition is wrong, for this reason.
The Kuiper belt and scattered disk are where all the remaining stuff left over from the formation of the solar system ended up. It was pushed out there by the larger planets. Unless the body is very large, for example like Uranus, it's not going to be able to "clear it's orbit" in that region of the solar system. If another large planet did exist out there, it would probably scatter everything in it's orbit, effectively pushing the Kuiper belt and scattered disk further out. Any smaller body, perhaps even an Earth sized body, would be unable to clear it's orbit. So, if the Earth's double was found out there, you would have to call it a "dwarf planet" by the current definition. That doesn't make sense.
And now Elon's thinking... Great, now I need to make my own Air Force with my own radar systems...
At the Texas launch site, will SpaceX be providing launch radar or will the Air Force?
Well, Gallifreyans are/were millions of years ahead of us, philosophically and technologically. Why confuse the humans, as wonderful as they may be, with a bunch of technical jargon.
As to the role of the neutron flow... Isn't it obvious?