Doom is a fact of life. No matter how far back we go we find doom. So why have the Doomstead if doom is just a fact of life!?
Because the kind of doom we concern ourselves with here has human roots. Climate change, resource depletion. These are problems that humans caused themselves. Doom as the result of human action or INACTION is our primary concern, though decent material concerning doom in general is welcome.
Breathing in Victorian era London was pretty unpleasant. certainly qualifies as human caused.
QuoteAs soon as I escaped from the oppressive atmosphere of the city, and from that awful odour of reeking kitchens which, when in use, pour forth a ruinous mess of steam and soot, I perceived at once that my health was mending... So I am my old self again, feeling now no wavering languor in my system, and no sluggishness in my brain.
Seneca AD 64-65
The point being to save as many as you can.