The islands of the Caribbean basin are predominantly net energy importers, with the exception of Trinidad and Tobago. Agriculture and natural resource extraction activities continue to constitute the basis of the islands' economies, though the tourism and service sectors are growing. In recent years, the Caribbean countries have been worried that higher global oil prices will impair their efforts to expand economically. In response, the island nations have been discussing ways to better integrate their energy sectors, especially in regards to increased natural gas exports from Trinidad and Tobago to other islands. These efforts have also focused on the major external energy suppliers to the region, such as Mexico and Venezuela.