For protein we can probably crispr in the ability for us to synthesize the essential amino acids that we currently cannot. Synthesizing mono unsaturated fats di

For protein we can probably crispr in the ability for us to synthesize the essential amino acids that we currently cannot. Synthesizing mono unsaturated fats directly from co2 and water is also certainly possible. Carbs seem harder but likely possible, agriculture might become just the way we get micronutrients, and all macros require no land. So I agree all that is far more possible in the near future than leaving earth. The energy required for that stuff is still a huge problem. Even if all our power generation was renewable, simply using all that power dumps the heat into our environment. Right now that isn't so noticeable, but our power demands are growing exponentially, the estimates on when that starts being a climate issue vary from centuries to decades, but its out there.