By 2100 A.D. as Kaku predicts we will approach a Type 1. We will capture all the solar energy that reaches Earth increasing our energy supply by a factor of 100-billion. We will have harnessed nanotechnology and warp drive propulsion and will be a civilization of this world and off this world.
By 2200 A.D., a mere century later we will approach Type 2, harnessing all the energy of our Sun, another 100-billion-fold increase. We will be extra-solar inhabiting planets on many nearby stars.
By 3000 A.D. we will have harnessed the energy of every star in the Milky Way, another 100-billion-fold energy increase. As a Type 3 we will traverse the galaxy and will, along the way, meet many other technologically advanced civilizations.
A Type 4 civilization will harness dark and extra-galactic energy. Such a civilization would be unrecognizable to us as such because it would be indistinguishable from the Universe itself. Would we evolve into pure energy? Would a Type 4 civilization be immortal and omnipotent.
…to attain Type 4 we will reach much further into the future, to 12000 A.D. At that point we will have transcended the physical reality of our Universe and may even have poked through to parallel universes in the multiverse.
Sounds delusional? Remember where human civilization’s technological achievements were in 1000 A.D. What would a person living in that time think of the world in which we live today? Magical? Incomprehensible? One thing we know for sure, technological breakthroughs that at one time took a century to achieve, now can happen in a year. It remains true that some technologies are harder to crack, like developing fusion energy. But today we are much closer to achieving that fusion breakthrough that alone will move us faster to becoming a Type 1 civilization. And after that will the rest unfold?