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processing, packaging, distribution, and product consumption and that the integratedmanagement of such waste is, therefore, a social co-responsibility and requires thejoint, coordinated, and differentiated participation of producers, distributors, consumers,users of sub-products, and of the three orders of government as applicable,according to a plan of market feasibility and environmental, technological, economic,and social efficiency.Furthermore, it is provided that in carrying out the policies in relation to prevention,valuation, and integrated management of wastes, the issuance of legal provisions andactions derived therefrom, as well as in the generation and integrated management ofwastes, the principle of shared responsibility of producers, importers, exporters, sellers,consumers, waste handling service companies, and the authorities of the three levels ofgovernment must be observed, given that co-responsibility is considered essential inorder to ensure that the integrated management of wastes is environmentally efficient,technologically viable, and economically feasible.Thus, it can be asserted that the law imposes co-responsibility when producers, distributors,consumers, users of sub-products, and the three levels of government areinvolved in the generation of waste. However, the scope of the concept of co-responsibilityis very unclear in that the consequences and obligations for the parties involved are notspecified.In this regard, the concept of shared responsibility is also mentioned in the Regulationof the Wastes Law. However, the Regulations do not provide additional specificationsregarding the consequences, obligations, and scope of such co-responsibility andonly provide that (a) the scope of such shared responsibility shall be determined in theManagement Plans described above and in accordance with the guidelines provided inthe official Mexican standards (NOMs) that shall be issued by the Federal Governmentin this regard (which to this date have not been published); and (b) the shared responsibilitywill also be applicable for the integrated management of urban solid and specialmanagement wastes that are not subject to management plans.291Environmental Law3.6. Liability with Respect to the Contamination and Remediation of SitesAnyone responsible for the contamination of a site, as well as damages to health as aresult thereof, is obligated to remedy the damage caused, according to the applicablelegal provisions. Furthermore, the owners or possessors of private property and holdersof concessioned areas whose soils are contaminated are jointly and severally liable fortaking the necessary remediation actions, without prejudice to their right to recoverfrom the party that caused the contamination.In addition to the remediation of the contaminated site, anyone responsible for thecontamination of a site may incur civil, criminal, and/or administrative liability.