Pretty much the same stuff we heard about a couple years ago. When the regulatory environment is such that underwater drilling activity / equipment gets pushed 55 miles off shore, it severely complicates the process and makes recovery from accidents / malfunctions that much more complicated.
Mother nature releases this type of gas into the environment periodically all by herself, as we saw in this thread:
http://www.politicalchat.org/showthread.php?t=6044 The biggest difference between the two scenarios is that their no BP or Halliburton attached to mother nature's release, so there's no one for the lawyers to sue to the Dems to haul before some stupid committee to testify.