I'm not a climatologist so I can't claim to have expert knowledge but I do have a pretty broad general knowledge. Also, I live in a country which, in recent decades, has seen crippling droughts that in all likelihood were the result of climate change brought about by human activities. I don't find the drought posited in Howling Wilderness to be so unrealistic as to be thrown out wholesale. In any case, in your campaign you could have the drought ending within a couple of years. That wouldn't see the US knocked back to the stone age.
As for US carriers roaming the high seas, I could maybe see a couple within a few years of 2001 being brought back into service. There have been discussions on this forum about US carriers and other major surface combatants being beached, docked or stranded for one reason or another that could be brought back into action. But a US carrier participating in Op Omega? Sorry, but that directly contradicts canon so for any campaign I would run, there's not a compelling enough reason for me to include it.
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 "It is better to be feared than loved" - Nicolo Machiavelli
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