Chamber Petition to EPA Valid, Alternative Not so Much

The U.S. Chamber of Commerce announced today that it will file a petition challenging the EPA's endangerment finding of carbon as a pollutant which greatly expands the agency's authority under the Clean Air Act. The petition is sound and justified, however the Chamber's assertion that the issue is better suited for congressional action and enactment of bi-partisan legislation rather than through agency action seems to miss the point. If the Chamber is filing a petition questioning the reasoning and justification behind the EPA's endangerment finding, what would be the basis for legislative action crafted to address the same questionable "danger"?