I personally believe that all 8 billion plus humans on earth need to prevent human extinction in whatever ways they are capable of

 Part of the way this is done is to stop all people who are working (whether they realize it or not) towards human extinction. However, many people like this might not realize even that they are creating human extinction by their actions.

So, likely the best way to handle this is to help educate others how to prevent human extinction in the first place.

Otherwise, the human race will or could go extinct some time this century.

Who would most naturally extinct human beings?

1. Likely Autonomous Robots of the Air, Sea and Sky and Water and under the ground. This would be the most likely cause of Human extinction at this point.

2. The 2nd likely cause of human extinction would be Global Climate changes if people don't move underground before winds where they live go above 500 mph at least 1 day a year.

Because a 500 mph gust of wind is going to literally blow down everything made of wood wherever it is on earth uncluding all trees and plants.

3. Also, there could be unforeseen events of one kind or another which extinct the human race here on earth too.

So, being aware of all this we should all work (all 8 billion plus of us) towards preventing human extinction this century.

By God's Grace