Lord Zack's Planescape
The world of Uerth on this plane has similarities to the worlds of Oerth and Earth. Sometimes it is described as being a part of a spectrum, each progressive world having less magic than the world before it. On Uerth, dweomers are weak, chancy things. Technology and culture are similar to that of early 20th century Earth. The world has just gotten through a great war that stretched across the whole world just a decade ago.
A different Uerth is sometimes spoken of. This world is very similar to Oerth, but reversed in alignment.