 Cadmium is also an environmental hazard . Human exposure is primarily from fossil fuel combustion , phosphate fertilizers , natural sources , iron and steel production , cement production and related activities , nonferrous metals production , and municipal solid waste incineration . Bread , root crops , and vegetables also contribute to the cadmium in modern populations . 
 Cadmium <a href='drop_aux' title='1'><mark>is</mark></a>also an environmental hazard . Human exposure <a href='drop_aux' title='2'><mark>is</mark></a>primarily from fossil fuel combustion , phosphate fertilizers , natural sources , iron and steel production , cement production and related activities , nonferrous metals production , and municipal solid waste incineration . Bread , root crops , and vegetables also contribute to the cadmium in modern populations . 
Cadmium also an environmental hazard . Human exposure primarily from fossil fuel combustion , phosphate fertilizers , natural sources , iron and steel production , cement production and related activities , nonferrous metals production , and municipal solid waste incineration . Bread , root crops , and vegetables also contribute to the cadmium in modern populations .