Rising temperatures could boost mercury levels in fish by up to seven times the current rates, say Swedish researchers. They've discovered a new way in which warming increases levels of the toxin in sea creatures.
In experiments, they found that extra rainfall drives up the amount of organic material flowing into the seas. This alters the food chain, adding another layer of complex organisms which boosts the concentrations of mercury up the line. The study has been published in the journal, Science Advances.