In a prior opinion, we certified to the Supreme Court of Texas the sole issue on appeal in this diversity action: whether Environmental Protection Agency (EPA) enforcement actions taken pursuant to CERCLA1 constitute a “suit” within the meaning of commercial general liability policies, thereby triggering a duty to defend.2
The Supreme Court of Texas answered the certified question, concluding that the term “suit” in the policies “must also include CERCLA enforcement proceedings by the EPA”; the court subsequently de*259nied rehearing.3 Because the district court granted summary judgment for the defendants on the ground that they had no duty to defend,4 we REVERSE the district court’s grant of summary judgment and REMAND for further proceedings.