Which of the following statements, if true, would most seriously WEAKEN the claim that 'introducing autonomous electric tractors will immediately reduce the total carbon footprint of national agriculture'?
Options:
(A) Over $80\%$ of the national electricity grid powering the charging stations is generated from coal-fired thermal power plants
(B) Electric tractors operate with zero direct tailpipe exhaust emissions
(C) Electric motors have higher mechanical torque efficiency than diesel engines
(D) Autonomous guidance systems reduce operational field overlapping
Answer Key:
A
Step-by-Step Solution & Explanation
If the electric grid relies heavily on coal combustion, emissions from electricity generation and transmission may equal or exceed diesel emissions on a lifecycle basis, directly undermining the claim of an immediate net carbon footprint reduction.