Croats of Bosnia and Herzegovina Dalmatian Croatia formed a united Croatian kingdom, which included Dalmatia and part of Bosnia and Herzegovina, Pannonia (eastern Slavonia and northeastern Bosnia), and Savia (western Slavonia). In 1102 Croatia entered into a union with the Kingdom of Hungary. After this, Bosnia, which was earlier part of the Kingdom of Croatia, started to disassociate with Croatia. At first, Bosnia became a separate principality under Ban Kulin who managed to solidify Bosnian autonomy at the expense of more powerful neighbours, but only in the 14th century did Bosnia become a formidable state. In the 14th century, King Tvrtko I conquered part of
Environment of Bosnia and Herzegovina of fossil fuels. High oil prices may discourage its widespread usage. Compared to the Western Balkan region, however, Bosnia and Herzegovina is the leader in the usage of renewable energy. In 2008, the only other country that reported a growth was Croatia, with a 0.6% growth of renewable energy usage, following Bosnia's 1.32%. All other countries, such as Albania, Macedonia and Serbia reported drops. Hydroelectric power is in majority with 51.8% of the renewable energy share, while biomass is at 48.14% and geothermal at 0.04%. There is very little defined structure to environmental laws and offences in Bosnia and Herzegovina.