For one reason or another some agricultural terms still haven´t been translated into Spanish, or do not have a Spanish equivalent yet.
Terraculture might be a good example for that, I´d say it is a new term that is settling down on our terminology, may be too new to definitely get established.
Experts on this topic, like Jonathan Foley, define the term Terraculture as:
Farming for a whole planet.
I strongly recommend the following video if you still believe that humans can get things back on track, regarding Planet Earth.