To be veridical, I dont think the world will reach a population of a trillion for at least centuries. Whats more plausible is that we will colonize different planets like the moon and mars, or where ever. Since the worlds population is growing, that will mean there will be more scientists, engineers, technicians, builders, and terraformers, that will engineer and improvise a way to escape this planet in captivity.
But I believe its possible to house hundreds of times more people in this "untapped earth", with the use of My innovative prophecies.
We have to plan for the future and take it one day at a time as well.
I love people, the more the merrier.
~PEACE~