I just completed the first rung of Physics research which gives me the Extractor Amplification upgrade. I've selected a Concrete Extractor but there doesn't seem to be an upgrade option. Any ideas?
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There should be a new icon in the top right corner of the extractor building panel (above the normal buttons.), slightly grayed out
I was going to ask the same question about the Wind Turbine upgrade (Polymer blades). Assume the answer is the same....