A method of treating a subterranean formation penetrated by a wellbore, the method comprising pumping a wellbore fluid into the wellbore, the wellbore fluid comprising an aqueous base fluid and an environmentally friendly slurried gelling agent meeting at least two of the following three criteria: (1) Biodegradation: a) 60% in 28 days as measured by OECD 306 or any other OSPAR-accepted marine protocols, b) or in the absence of valid results for such tests: i. 60% in 28 days as measured by OECD 301B, 301C, 301D, 301F, 310, Freshwater BODIS or ii. 70% in 28 days as measured by OECD 301A, 301E); (2) Bioaccumulation: a) a bioconcentration factor of less than 100; b) log Pow≦3 and molecular weight 700, or c) if the conclusion of a weight of evidence expert judgment under Appendix 3 of OSPAR Agreement 2008-5 is positive; and (3) Aquatic Toxicity: a) LC5010 mg/l or EC5010 mg/l and performing a downhole operation.
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