not fat people per-se, but the industrial scale agriculture that permitted their propagation. Modern agriculture is driven by oil (for farm machinery) and nitrogen based fertilisers (produced using the haber-bosch process and a great deal of oil based energy). When oil begins to run out, modern agriculture will fail and along with it, the artificially...
No, it is not for sure that Man will destroy the planet. He may well do but it is not for sure. There are far bigger forces out in the Solar system that could easily destroy us, just one small hit and th eplanet is knocked off course and we are gone. Even just hitting the moon would have devestating effects.
Nature indirectly as the use of antibiotics and antivirals results in increasingly resistant organisms one big mutation giving greater virulence combined with a long pro dromal period and a mobile population .....
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