Some fish, like the bluefin tune pictured here, are accumulating higher levels of mercury due to human activities. (Credit: Guido Montaldo/Shutterstock)

The USDA recommends Americans eat at least two servings of seafood every week. Most of us turn to tuna – canned or otherwise – and cod. Fish tacos and fish and chips? Yes, please!

But now researchers find mercury levels in these popular seafood options are on the rise thanks to overfishing and climate change. Scientists say the findings c