Trees 2222 | uncarved blocks
It all went very fast in the end. It had taken roughly two centuries for carbondioxide levels in the atmosphere to peak, from the late 19th century to the second half of the 21st century. After that, it took another two centuries for emissions to return to pre-1870 levels, even if it would take much longer for the amount of carbondioxide that was already in the atmosphere to diminish. That would take thousands of years. A curious symmetry became apparent to people living in the saddle time between the old and the new world. It had taken some five thousand years for humanity to cover the earth in cities, from Uruk, the first city ever, which had city walls in the fifth millennium BCE, to the urban conglomerations that spanned the globe in vast, drawn out and interconnected cityscapes that lay like dendrites over the continents and formed a global web in the 22nd Century, stretching out to the remotest corners of the world. It would take another five thousand years for the cities to...