BRUNSWICK — April 5 was the last straw for TJ and Cheri Siatras. That morning, the husband-and-wife owners of Joshua’s Restaurant & Tavern declared that, starting April 6, drinks would be served without straws, and only compostable straws would be available on request. The inspiration came from a school report the Siatrases’ 12-year-old daughter, Danika, did on ocean pollution, which they said was “depressing as hell.” “It seems like the problem is so far gone that it’s insurmountable,” the couple said about their decision in a post on Facebook.