For over a decade, Josh Chatten-Brown has represented the Sierra Club's San Diego Chapter in successfully litigating challenges to the County of San Diego's legally inadequate Climate Action Plan. San Diego County made a commitment in 2011 to significantly reduce greenhouse gas emissions in the County and to prepare a legally binding Climate Action Plan.  But, instead, the County opened up potentially unlimited development throughout the County by allowing developers to buy carbon credits from anywhere in the world.  On behalf of the Sierra Club, attorneys at Chatten-Brown Law Group filed a lawsuit to require the County to honor its commitment to ensure that greenhouse gas emissions are reduced within the County.

Attorneys at Chatten-Brown Law Group also filed lawsuits against six sprawl development projects that relied on an unlawful carbon credit program.  These sprawl development projects in undeveloped areas of the County result in significant greenhouse gas emissions from the car trips to and from their remote locations. Through legal victories and settlement agreements, attorneys at Chatten-Brown Law Group have forced the County of San Diego and developers to mitigate the greenhouse gas emissions of their projects.