29. Many countries around the world have now been working on "2050 Net-Zero Emissions". What is the meaning of the above-mentioned "Net-Zero Emissions"?
(A) Cutting light emissions that cause light pollution to nearly zero
(B) Cutting greenhouse gas emissions to nearly zero
(C) Cutting radiation emissions to nearly zero
(D) All of the above
(E) None of the above

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統計: A(0), B(0), C(1), D(1), E(0) #3191082

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