The more immediate problem of the rhinos, lions, leopard, cheetahs, elephants a.s.o. is not very different. Take one species away and something will go wrong in the alimentary chain and ecological system. Not easy to explain to someone who sees the animals as food or means of profit!
As a start this will be useful, but as it is a political question It will not be done before the cows come home i.e. when the rhinos will be extinct........Fence needs to go up, more troops on ground and if Mozambique doesn't want to co-operate, close border so no trade goes through to or from port, all finances going to Mozambique from all their citizens employed here is stopped. Holiday makers are encouraged not to go to Mozambique.
It always comes down to the same problem: How can you put pressure on a government which is sitting firmly in the saddle without any serious opponents?? Until the majority of the population does not understand that they need an opposition party, nothing is going to change IMO