The problem is there is no other habitable world within reach of current travel technology.
Habitable means there must be breathable air, tolerable temperature, water, food and raw materials.
The likelihood we will discover a habitable world and have the means to transport the people and materials there needed to set up a new cilvilisation is close to zero.
We will likely wipe ourselves out way before that becomes even a remote possibility.
And it's probably good that we will because we have ruined the Earth and we would ruin wherever we went to next.
The only possibility we have is if some friendly aliens visit the earth and are benevolent enough to offer us their already-developed technology to achieve it.
It's called biological warfare and has been done before. Banned under Geneva (though how you'd actually stop it I don't know - I guess it gets tried quite often and gets foiled and not mentioned to maintain public order - can you imagine people if they got told x amount of plots have been foiled to release deadly diseases in this country. Xenophobics would be in heaven)
The problem is there is no other habitable world within reach of current travel technology.
Habitable means there must be breathable air, tolerable temperature, water, food and raw materials.
The likelihood we will discover a habitable world and have the means to transport the people and materials there needed to set up a new cilvilisation is close to zero.
We will likely wipe ourselves out way before that becomes even a remote possibility.
And it's probably good that we will because we have ruined the Earth and we would ruin wherever we went to next.
The only possibility we have is if some friendly aliens visit the earth and are benevolent enough to offer us their already-developed technology to achieve it.