Smyth, *Greek Grammar*, at 971, says that when two subjects - both singular and connected by a disjunctive - are taken together, the plural (rarely) occurs. My guess is that the logic applies in English, too: if "or" is more connective than disjunctive in force, you use the plural to refer to both subjects as a group.
So the translation is accurate, *and* the grammar is correct in the original.
I don't think many of this kind of critic have actually read James 2.15-17, because it directly impeaches "justification by faith alone:" "Faith is dead without works."
Mr Justice Burton [i.e., the judge who made the ruling in question] said he had no complaint about Gore's central thesis that climate change was happening and was being driven by emissions from humans. However, the judge said nine statements in the film were not supported by mainstream scientific consensus.
"Protozoa are small, and bacteria are small, but viruses are smaller than the both put together."