Corruption - the misuse of public power for private benefit - is difficult to measure because officials who take bribes try to hide such activity. Corruption skews public spending toward the sectors where bribing is easier, shifting it away from education, health, and maintenance of existing infrastructure and toward large public works construction and the buildup of military. The environment also suffers. Deforestation is often spurred by corruption, and public officials have used concessions for mining and fuel extraction to liquidate a nation's resources without passing the revenue on to citizens, according to information from the Worldwatch Institute.