Is it a good idea if all humans move to other planets and wait until the environment improves before returning to Earth?

The prerequisite for this is that humans have the technology for interstellar immigration.

With the level of modern human science and technology, the cost of sending the weight of a person and its life-support device into geosynchronous orbit is as high as tens of millions of dollars and will cause serious damage to the earth's environment. For the time being, It's impossible.

Not to mention, the nearest star to humans is about 4.2 light-years away. With the level of human spaceflight that can be foreseen within 500 years, it will take at least several hundred years (one-tenth the speed of light) to reach Proxima Centauri - -----The fastest spacecraft calculated by humankind's current scientific theory is one-tenth the speed of light.

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So, this idea is very good, but it has no feasibility in the short term (within 500 years).

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PS: According to calculations by human scientists, the fastest possible spacecraft is a nuclear fusion rocket that can reach one-tenth the speed of light. This is according to existing science. The fastest speed achievable by theoretical support. Note that it is supported by scientific theory rather than scientific technology.

The super-light spacecraft in science fiction novels are not supported by any scientific theory at all. Their theories only do not violate existing scientific theories-------that is, they bypass the limitations of existing scientific theories. .