Definition: In this task, you're given a statement and three sentences as choices. Your job is to determine the neutral choice based on your inference from the statement and your commonsense knowledge. The neutral choice is a sentence that neither agrees nor disagrees with the statement. Indicate your answer as '1', '2', or '3', corresponding to the choice number of the selected sentence. If sentence X agrees with sentence Y, one's correctness follows from the other one. If sentence X disagrees with sentence Y, they can not be correct at the same time.
Input: Statement: Finally, as greenhouse gas emissions are projected to grow exponentially in the developing world in the next two decades, we must evaluate the costs of imposing domestic reductions as a very high cost against potentially low-cost opportunities for mitigating and sequestering carbon emissions in the developing world. Choices: 1. Greenhouse gas emissions are estimated to grow in both the developing and developed worlds. 2. Greenhouse gas emissions from the developing world are non-existent and can be discarded. 3. Lowering greenhouse gas emissions from the developing world would greatly reduce global warming.

3