To be brutally honest, nothing lasts eternal (except God if you believe in one). No matter how hard we try, we will end too and so would the world and the sun and the solar system, and the Galaxy. Maybe the universe itself will end by collapsing.... And surely everyday we are nearing to that inevitable event because nature doesn't care what you think about it. It goes on its own ways and thinking 
You are talking about Existential nihilism. EVERYTHING we do will eventually atrophy.But the world itself is not ending at this time. Minor population adjustment.
even if it is - its only for other species to kick it in and get all the goods in this evolutionary race
If the world is over then not everything can do everything in the evolutionary competition No one can say when the world will end it is only God who knows. Suddenly the world will end, nobody will know anything It's just an epidemic.