Well, if you moved them indoors, you don't need to keep individual air conditioning running in the cars (which you really couldn't do without running the engines, as the systems are interconnected in most currently existing cars). You could just air condition the building. As for sound, most...
What kind of information are you looking for? How people lived? What they wore, or ate, or did for entertainment? Historical annals of who ruled what area in which century? Literature from the period? If I know which topics you're most interested in, I can pick out links for you.
Sources for what, exactly? I've got loads of stuff, but rather than just dump it all on you to sort out, it might help if I know what you want/need most. :)
Oooh, shiny! Hey, if you want a somewhat plausible if completely arbitrary dating point that comes close to coinciding with the BCE/CE split so you can make a case for your particular dating convention, why not use the inauguration of the Forum of Augustus? IOTL that happened in 2 CE, so it...
Well, Unitarianism as a non-Trinitarian Christian sect originated in 16th-century Europe and by the 18th century it had taken root in the New World as well. So all you'd really need is on this side of the pond would be for it to attract more adherents and thereby exert a stronger and more...
Likewise in northern Ohio. Of all the rental houses I lived in during my years in Cleveland, only ONE of them had central air. In the rest I relied on the lake breeze (I lived within half a mile of the shoreline), fans, and cold showers. I'm sound-sensitive, so window air conditioners really...
Aha! That explains the reasoning behind something I've known for a while. I belong to the Society for Creative Anachronism, whose members divide the world up into a number of geographical kingdoms in which we play our roles. The kingdom that includes Australia and New Zealand is called Lochac...
Okay, but I don't think germ theory was even a thing way back then. So first you'd need to make that happen, and none of this necessarily hinges on religious diversity.
All vegetation, when it is burnt or otherwise used as fuel (digestion by people, digestion by animals, digestion by microbes) releases its carbon back into the environment. Rotting (digestion by microbes) is the slowest of these, and the rate of carbon release from rotting jungle vegetation is...