To avoid such a scenario, Lunt says Angel's project would have to be operate at half strength; all of which reinforces his view that the best option is to avoid the need for geo-engineering altogether.
What does "all of which" mean here?
"all of which" means all of the objections to the project that have previously been mentioned.
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"all of which" means all of the objections to the project that have previously been mentioned.
Syntactically, this is called a 'fused-head partitive' construction, where "which" refers to a set x, and all of which then means "all members of set x".
The meaning of x is recoverable from the antecedent of the relative pronoun "which", and since all of them implies a plurality of facts, presumably these were mentioned previously in the discourse.