Some have propose that global warming may cause and increase in the number of tornadoes and number of strong tornadoes, but so far there has been no substantial evidence of that.
Aside from that possibility it is unlikely that tornadoes are any stronger or more frequent as a result of human activity. However death tolls and injuries may be higher as a result of practices such as building houses without basements and trailer parks in tornado prone areas. These do not affect the tornadoes themselves, but leave people who live in such places more vulnerable.
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Nothing. We cannot prevent tornadoes.
Supercell tornadoes are usually worse. Nearly all F3 and stronger tornadoes form in supercells.
This cannot be answered simply, as both hurricanes and tornadoes vary greatly in how bad they are. The impacts of both tornadoes and hurricanes can range from negligible to devastating. That said, the very worst hurricanes can be far deadlier and more destructive than the worst tornadoes.
Humans cannot start tornadoes.
None. There is nothing that humans can do to stop tornadoes.
Earthquakes are worse. Earthquakes strike with no warning and cover a larger area than tornadoes and can have much higher death tolls, especially those that trigger tsunamis.
People can make heart disease worser by drinking too much alcohol
Humans have no control where and if tornadoes occur.
No. planes do not make tornadoes
There is flooding, that kills the most people, the wind can bring trees down and they can also make tornadoes
Humans do not cause tornadoes. While climate change may affect tornadoes, it is still uncertain how exactly this will play out.