Attacks on ships by pirates off the Horn of Africa have been declining since Operation Atalanta, a European mission to secure the region's water for shipping, got underway in 2008. But now the problem is on the rise in the Gulf of Guinea.

The International Maritime Bureau in London, which monitors pirate activities, has reported at least 10 incidents in the Gulf of Aden and at least 28 in the Gulf of Guinea in 2013. The number of attacks on the Horn of Africa has been falling steadily.

Failed governance in Somalia led to overfishing of its coastline by other countries in the early 1990s. Toxic waste was subsequently dumped in its waters, crippling the local fishing industry. The combination of factors caused some Somalis to resort to piracy, while others later determined it was a good way to make money. Piracy surged in Somali waters in the late 2000s.

Pirate attacks along the Horn of Africa have decreased since the international naval presence there was bolstered. In 2012, 35 ships were attacked by pirates off the coast of Somalia, compared with 163 in 2009. In former piracy hotspots, locals are more concerned about fishing than capturing cargo ships.

Those captured and accused of piracy can face trial far from their home countries. Where they end up depends on who catches them or the ship they attacked. In 2012, for example, 10 Somalis were sentenced to jail by a Hamburg court for attacking a German-flagged ship. The UN and EU are backing efforts to improve the judicial systems closer to where pirates operate.

West African pirates' methods can be more violent than those off the Horn of Africa. While Somali pirates know they will forfeit ransom if their hostages come to harm, pirates in the west are mainly interested in the oil or valuable cargo on board and less concerned about the people. Their hijacking methods are similar - approaching large vessels out at sea in small craft.

In the West, Nigeria has been exporting oil for the past 20 years, but most of its people have not benefited from the extensive revenues. Almost two-thirds of Nigeria's population lives below the poverty line. To those without livelihoods, the risks of piracy can seem worth it. Political instability and social conflict have left room for pirate gangs to consolidate in the Gulf of Guinea.

While a heavy international military presence was effective in reducing piracy near Somalia, the same solution cannot easily be applied to the Gulf of Guinea. As those countries are sovereign states, their own authorities must work together to find a solution. Still, international interest in finding an answer is high, especially since the region supplies 20 percent of Europe's oil and gas.

The key to reducing piracy is improving people's lives on land. The challenges are vast - from improving judicial systems to creating a sustainable economy to effectively managing the consequences of natural disasters - like here in a Somali food aid facility where families received rations during a severe drought in 2012.