Can we really lower zinc levels that easily?

Recently Efsa proposed that we should lower the zinc levels in animal diets. I agree, oversupplying leads to nothing and we should be more responsible in the way we use certain things. But is this solely a European standpoint and do we really know enough to lower the levels? Too much zinc in the animal’s diet can lead to excessive excretion of this heavy metal. Plants and the environment cannot deal with heavy metals. So, the levels must be lowered, as stated by Efsa. Fair enough, and Efs