Waste incineration power generation is included in the "Eleventh Five-Year Plan" for renewable energy development of the National Development and Reform Commission. Some experts believe that waste incineration is a safe and environmentally friendly waste disposal method. Which of the following, if true, would most weaken the above-mentioned expert opinion? ['Organic matter produced by incineration of garbage cannot be naturally decomposed.', ' ton of domestic waste can be burned to 300 to 500 degrees after incineration.', 'Residue of 1 ton of domestic garbage after incineration is only 10% to 15%.', 'In Japan, 70% of domestic waste is recycled instead of incinerated.']