Over 1,200 gallons of gasoline were used in the iconic opening shot of the napalm’d jungle. Furthermore, tires were burnt to create more smoke and canisters dropped to resemble genuine napalm. Unsurprisingly, acres of woodland were wiped out in seconds and Coppola even commented that they would never have been able to get away with it had they been filming in the US.
Not that the Filipino government was too concerned. They were a little too busy with a civil war to care about environmentalism.