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After a brief comparison with earlier work (Section 5.1) we offer in Section 5.2 an assessment of the major uncertainties in our budget at low redshift, with emphasis on the more indirect arguments we hope constrain the budget of baryons in forms that are unobservable in practice. We review the test from the theory for the origin of the light elements in Section 5.3, and in Section 5.4 we compare these results with measurements of the diffuse baryons at z approx 3. Some concluding remarks are offered in Section 5.5.