Additionally, fracking for natural gas had been done in the Brazilian cities of Vale do Parnaíba (Minas Gerais), Parecis (Mato Grosso), and Recôncavo (Bahia). The expectation was the areas would increase natural gas reserves to 208 trillion cubic feet (TCF), but estimates have been rolled back to 32 TCF. According to the EIA, the estimated gas reserves in the country are the tenth highest in the world. Shell, Petra, and Fortress Energy have been fracking and will likely extend their exploration licenses. The environmental permits remains at the discretion of individual states.