what logical fallacy is used

My opponent will say that recycling isn’t an issue here, but that’s just because they don’t care about the sea turtles or other marine life affected by plastic in the oceans

The logical fallacy used in the statement is Ad Hominem, specifically the type known as "poisoning the well." The speaker dismisses their opponent's argument by attacking their character, suggesting that their lack of care for sea turtles and marine life makes their argument about recycling invalid.