The ECCR provided Shell with the report in draft form and invited it to comment.
In response Shell said that the report is not a sufficiently complete or balanced assessment of its activities and argued that "the primary and overriding authority and responsibility" for what takes place in the Niger Delta rests with the state.
The company also commented that the text makes "many unsubstantiated claims" , though it acknowledged "a convergence of ideas and themes" and said it had already embraced some of the report's recommendations.
Responding to further enquiries from BusinessGreen.com the firm said the decision to stop gas flaring would mean halting production and could only be taken by the Nigerian government.
Shell also claimed it had spent $3bn on a plan to stop gas flaring worldwide - though the scheme is currently stalled because of "lack of funding and security".
The report is the latest in a long line of studies criticising Shell's involvement in the Niger Delta. The company has also faced legal action and last year reached a $15.5m (£9.8m) out-of-court settlement with relatives of a group of activists who were arrested and executed by the Nigerian government after protesting against the development of the delta.
In related news, UK-based NGO Platform has today alleged that Tullow Oil has signed an agreement with the Ugandan government that will allow it to flare gas at its operations in the country.
The NGO released a report that found that under the deal oil flaring will be allowed with the consent of the government and that "consent shall not be unreasonably withheld or delayed".
The report, entitled Cursed Contracts: Uganda's Oil Agreements Put Profit Before People, also found that the deal provided few safeguards to ensure any environmental clean-up costs are adequately met by the company.
"Urgent changes should be made to the contracts, legislation and regulatory regime covering oil to achieve a measure of environmental protection, to minimise economic distortion through revenue flows and to capture a more appropriate share of the revenues," the report concludes.
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