Well that depends. How many people know about it - is it a secret that only I know or a few select people know about, or is it common knowledge. Is it inevita

Well that depends. How many people know about it - is it a secret that only I know or a few select people know about, or is it common knowledge. Is it inevitable or can something be done to stop it or mitigate it's effect? And if something can be done, can I help? And finally, does the world ending mean that end of all Earthly life? No Moon or Mars base, or one or more spaceships with humans on them.