Everything points to this that I have studied so far. The Extinctions of birds and plants and animals tends to create situations where pandemics spring up.
In bird species for example, if one type of bird goes extinct (even in one area) another bird species comes in and takes it's place there that eats similar foods whether plants or animals or both. When this happens often the new replacement species of birds is more susceptible to carrying diseases. Then this new species of bird carries this first to chickens when the species eats the same foods as the chickens because often they can fly through chicken wire to get to the chickens food. Then the chickens get bird flu from sharing grains with birds and then the same thing happens with Cattle and Dairy cows and pigs when the birds share grains especially with all these animals. Then because the cattle and dairy cows are more similar to human mammals then this can eventually spread to humans from places like Dairy cows or cattle herds in Nevada or other places in the U.S. or around the world.
Because of all these changes to the ecosystem I think the human race needs to prepare for 10 to 20 major pandemics to travel worldwide and kill millions of people or more during each pandemic.
Hopefully, one of these pandemics doesn't cause the extinction of the whole human race eventually.
However, even in things like the Black plague in Europe and other places that sometimes killed 90 percent of more people, some people usually were immune with stronger immune systems so the likelihood of complete human extinction from a pandemic is still slight. (At least at this point).
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