If you would utilize all areas which have a nice orientation to the sun and they're not overly shaded, the power generated by photovoltaics would correspond to about 30 percent of our total energy demand.
Se fossem utilizadas todas as áreas orientadas adequadamente para o Sol, e que não sejam sombreadas demais, a energia gerada por fotovoltaicas corresponderia a cerca de 30% da nossa demanda total de energia.