Analysis of End Of The World

When I was young in school in Switzerland, about the time of the Boer War,
We used to take it for known that the human race
Would last the earth out, not dying till the planet died. I wrote a schoolboy poem
About the last man walking in stoic dignity along the dead shore
Of the last sea, alone, alone, alone, remembering all
His racial past. But now I don't think so. They'll die faceless in flocks,
And the earth flourish long after mankind is out.