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"Otherwise, we may never adequately address these problems that, in terms of both physical and temporal scales, represent uncharted territory."

I think it should be "that" and not "which," because "represent uncharted territory" is essential to the meaning, but the parenthetical phrase is throwing me off.

You're good.

.

You're good. You might go for this instead though:

"Otherwise, we may never adequately address these problems that represent uncharted territory in terms of both physical and temporal scale."