Are there any toxic exposures linked to child onset type 2 diabetes?

MEGACARBS! Well, am not sure of any 'environmental toxins' causing type 2 diabetes except drugs or chemicals known to be toxic to pancreas including the beta cells. I guess anything in excess is toxic to our body, so carbs in excess can stress the endocrine pancreas! And that is the most common cause for prediabetes/type 2 diabetes in young ones.
May be. Animal studies have shown that toxins may predispose to diabetes and obesity not clear the mechanism.
None acknowledged. A number of drugs and chemical agents seem to be toxic to the beta cell (insulin producing cells in pancreas) to cause type 1 diabetes. Cyclosporin (immunosuppressive), rodenticide vacor, l-aspraginase (chemotherapy for leukemia) are the examples.