In 4 Billion years TA?
I really hope you aren`t serious or really that stupid.
That makes no sense. The planet was uninhabitable for any form of life whatsoever 4 billion years ago. We are concerning life right now as we know it and the large population numbers of Humans. We simply have too many humans and the result of rising water levels is a massive influx of refugees, millions and millions, moving more and more inland which then puts intense strain on resources where there once wwas no strain. This will effect every single country economically as global crisis always do.
The human population trend is only growing upwards according to global birth rates so the disaster will be more and more devastating as carrying capacities in areas are reached and exceeded. Due to the population trend not changing the only mitigating thing we can do is reduce Carbon levels in the atmosphere which would prevent or lessen any such disaster.
Global Warming would not be much of a problem, at least for human lives and Global resources that humans consume, if there wasn`t such a large population of humans. OF course this is turning a blind eye to ecosystems, (which would eventually affect humans in some form) of many other wildlife which of course would be affected.
The planet will be just fine and it will be just fine without us so your argument is just ignorant(wanting to measure temperature billions of years ago). Evolution and Natural Selection are indifferent to humans just as it is indifferent to all life forms. The planet will exist fine with zero humans on it and it will exist fine until the sun explodes and there is no longer any trace that any of this was even here.
