The headlines

A pair of biologists is studying terns on a rock island just off the coast.
While walking on a distant part of the island, they are shot at by a group of
thugs operating a pot farm. This happens several times and the local law
enforcement refuses to investigate.
On their last day on the island they happen into a huge pile of harvested
grass that has been set out to dry. Quickly they decide to set it on fire to
pay the thugs back for shooting at them. The fire takes off and sends plumes of
smoke into the sky. As they are running for their boat, they notice that the
soaring birds are acting weird, spiraling out of control and crashing into the
trees.
The next day they read the headlines in the local paper:
Pot Farm Burns - No Tern Left Unstoned.