Recap post for the 23rd century.
THE WORLD IN 2300
Mankind has continued to expand out into space, albeit at a slower rate than in the 22nd century. There are now roughly 2.8 billion non-Terran citizens, and every part of the Solar System is inhabited, even Venus and the outermost reaches of the Kuiper Belt. Mars is the most heavily populated world outside of Terra, with a population of just over a billion. The frontier is rapidly disappearing on the Jovian and Saturnian moons, as all of the major ones have at least 50 million people each. Several worlds around nearby stars have been colonized, with the most distant human habitation being more than 13 light years from Sol in the Wolf 1061 system; wormhole travel has made interstellar transport and colonization far easier than it was a century ago. As such, more than 700,000 people live on worlds orbiting other stars; the most populous are the lush forest planet Gaia , in the Tau Ceti system (300,000 people) and the nearby planet Apollo, in the Alpha Centauri system (180,000 people). There are half a dozen wormhole tunnels now: one from the Solar System to each of the five other stars that humans have reached, and another from Alpha Centauri to Kapteyn's Star. Through the wormholes, it is possible to travel at speeds of up to 8 light years per day.
Terraforming is nearly done on Mars. The average temperature is 40 Fahrenheit, and the atmospheric pressure is similar to 10,000 feet above sea level on Terra. It is now safe for humans to go outside with no protection for several hours at a time. Large grasslands and lakes have sprung up across the planet, and the first trees, fish, and birds are being brought in or synthesized. The situation on Luna is pretty much the same; it even appears green and blue and brown when viewed from Terra. Even Venus and the Jovian moon Ganymede are being terraformed, though it is too soon to see any substantial effects on either. Further afield, the mining industries on Jupiter, Saturn, Uranus, and Neptune are now extracting upwards of 50 billion tons of hydrogen, helium, ammonia, methane, water, and other volatiles annually; Saturn is responsible for nearly half of this material.
Intraplanetary transport has gotten even faster and more efficient, thanks to several innovations during the 23rd century. For one thing, even mid-range cars no longer roll along on wheels; instead they hover a few inches above the road using room-temperature superconductors and manipulation of electromagnetic fields, and can typically travel at 400 to 500 miles per hour. Intertial dampening has solved the tyranny of acceleration problem, allowing vehicles to accelerate to their top speeds almost instantly without destroying the passengers. This allows Orbital Transport vessels to carry passengers halfway around the world in 15 minutes, and makes short-range vactrains travelling at 10,000 miles per hour practical. Interplanetary and interstellar transport continues to be done mainly with antimatter power, though scientists are researching a number of even more exotic energy sources that could theoretically be used.
Fusion and solar continue to make up approximately 91 percent of the energy market, but antimatter power plants now provide 8 percent of humanity's energy needs. Human civilization measures approximately 1.11 on the Kardashev Scale. Energy costs have fallen to 6 or 7 percent of what they were three centuries ago, though obviously personal and species-wide energy expenditure has continued to rise.
The life expectancy is now 197 years, while the oldest person alive is 249 years old. People remain physically about 25 until around 130 or 140 (or, in the case of mind transfers, until the very end). There are also millions of bicenterians who are alive and well. By 2300, babies born on Luddite Reservations account for the significant majority of babies born normally, as opposed to being synthesized. Discounting the Luddites, a total of 99.9 percent of infants in 2300 were synthesized, not born. The average new parent at the dawn of the 24th century is 55.6 years old. There is pretty much no more mental illness, and physical illness kills maybe one or two people in the Solar System per decade, outside of Luddite Reservations (the life-rich colonies like Gaia are responsible for several more, though that is to be expected). The progress of mind uploading in the 23rd century was similar to the progress of genome sequencing in the 21st, to the point that just about everyone alive has a map of their mind stored on a computer, something which can be done for just a few thousand dollars, by 2016 standards. Mind transfer procedures have thus become common: when an individual reaches the age of 120 or 125, they will often have their mind transferred into a fresh body specifically grown for that purpose. This is expensive, but most people can afford to do it, since it only has to be done once per century or so.
The population of Terra is roughly 21 billion. 89 percent of the population lives in arcologies, with another 10 percent living in traditional cities/suburbs and the remaining 1 percent living in rural areas. Most of the remaining land on Terra is a pre-industrial wilderness, as virtually all heavy industries have now been moved to orbitspace, something which is also underway on Luna and Mars. Cyborgs account for 77 percent of the population, androids (including biodroids) for 12 percent, and purely biological humans for 11 percent. Roughly 4.5 percent of the Solar System's population identifies with a religion, with Christianity and Islam roughly tied as the most common ones. The poverty rate is 2.5 percent, and the unemployment rate is just 1.1 percent. On the other side of the spectrum, nearly one in five adults over the age of 25 are millionaires, and there are hundreds of quadrillionaires, including one with a net worth of β5E+15, or $11,000,000,000,000,000 in 2016 dollars.
The military has progressed into a fighting force capable of operating on an interplanetary scale. There are 30 million IPAF personell, 8 million Space Marines in the IPSF, and tens of millions of police, military engineers, and military scientists. Project Warlock, whose existence has now been public knowledge for decades, has flourished, and there are now nearly 10,000 Warlocks. Gravity control, gravity-based weapons, forcefields, and femtotechnology weapons and tools are in use by the military, and the 66-year-old IPSF has a sizable fleet of interplanetary spacecraft and nearly two thousand space stations (out of a few tens of millions of registered space stations in the Solar System). The IPAF and the IPSF could easily defeat all the world's armies from even the year 2100 in about five minutes, such is their level of firepower and technology.
Human civilization is definitely something of a Crystal Spires and Togas civilization by this point, though without the togas. For instance, one would be hard-pressed to find a computer lying around in 2300, because typical computers are partially embedded within peoples' brains now. In general, almost every appliance, machine, and device at the dawn of the 24th century, is controlled entirely telepathically, with no need for buttons, dials, switches, and all the clutter found on machines from earlier centuries.
Femtotechnological advances such as nuclear isomer computing have continued to miniaturize and strengthen computational technology, to the point that supercomputers are nearly a billion trillion times more powerful than they were in 2016 and are capable of simulating entire environments down to the most fundamental level of reality. Quantum tunneling communication has also exploded into the mainstream in recent decades with the invention of the quantumnet. Now, near-instant communication is possible between all the worlds that humans have colonized. Crystal spires are indeed common, especially in the older arcologies from the Crystalline Era. The Era of Monuments is also in full swing, with its colossal fountains, majestic parks, and statues that would seem to break the laws of physics to an observer from three centuries ago. Gravity control has been developed, and a number of its initial applications have been perfected. Gone are the days when a spaceship had to spin for people on board to walk normally, and gone are the days when spaceships couldn't just casually hover in a planet's atmosphere using minimal fuel.