There are some absolute howlers. This, for example:

There is no better evidence for this than the fact that the rarest metal in the crust of the earth, gold, has been mined for thousands of years and continues to be mined in increasing quantities as technology advances over time, as shown in Chapter 3. If annual production of the rarest metal in the earth's crust goes up every year, then it makes no sense to talk of any natural element as being limited in its quantity in any practical sense.

Gold is not the rarest metal in the crust of the earth. It's rare, yes. But other metals, such as platinum and iridium, are rarer.