How then may the planet be fed sustainably? One set of answers revolves around convincing people to put different things on their plates. Vegetarians have the simplest solution of all, but try telling people in sub-Saharan Africa that they should stick to cassava.
One set of answers, set here means a group of things that have similar characters or belong together in some way, like a set of keys. Revolve around literally means to move around. For example the earth revolves around the sun. It could also be used to describe to have somebody or something as the main interest or subject. The sentence above could be paraphrased like this, the answers try to convince people to put different things on their plates.
Innovations such as these have enormous potential, if they can be industrialised and win over wary consumers. But changing what humans eat is not the only route to feeding a growing population more sustainably.
To be wary means to be careful when you're dealing with people or something because you thing there may be danger or problem. The synonym is cautious.
A more radical approach is to change animals’ diets. Efforts to reduce the amount of fish meal used in aquaculture have already paid dividends.
Dividend is the profit which is usually paid to the share holders in a company. Here if something pays dividends, it brings advantages at a later date. The sentence means Efforts
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