GMAT Critical Reasoning (CR) | Re: Acid rain, caused by high levels of sulfur dioxide and mercu

Here the argumentis:

Problem: Coal-fired power plants emit large quantities of sulfur dioxide and mercury -> leads to acid rain -> affect 1/3rd of China'sterritory
Government's strategy to reduce acid rain: aggressive goals set for next 5 years that focus on improving energy efficiency and increase in usage of renewable resources -> reduce emission of Sulphur dioxide & mercury pollutants

Question stem wants us to identify something that can weaken our belief in the