In the passage, representatives of power companies holds a view that storing coal ash are not necessary and might have some negative consequences. However, the speaker challenged the passage by three strong reasons.
First, the passage mentioned that power company representatives point out that effective environmental regulations already exist.For example, one very important regulation requires companies to use liner—special material that prevents coal ash components from leaking into the soil and contaminating the surrounding environment. From the lecture we can know that using liner are not sufficient, because harmful substances will leak into the water and cause damage to people, so we absolutely need a stricter rules.
Second, the passage mentioned that some analysts predict that creating very strict rules for storing and handling coal ash might discourage the recycling of coal ash into other products and consumers might buy the coal ash products.