Endophytic bacteria, microbes living in plant tissue, can change how a plant grows. But experiments with microbe communities shows that it’s not in a predictable way.
A problem with growing biofuels is that they can take land needed for food. What happens when you start growing biofuels on marginal land where food crops are not possible?
Buck Rogers found the land around New Chicago in the 25th century was polluted and barren. But pollution might not be a long-term problem if you have the right Brassica.