As foreign species such as quagga mussels and a killer fish virus continue assaulting the Great Lakes, federal policymakers are taking long-delayed steps to slam the door on other invaders.
But critics say the Environmental Protection Agency's plan does too little to prevent exotics from slipping into the lakes and other U.S. waters aboard ballast tanks of oceangoing cargo ships -- their most commonly used passageway.
Environmentalists prefer a bill approved by the U.S. House that would impose tougher requirements on shippers. But it's bottled up in the Senate, with time running short as Congress prepares for its August recess and the fall election campaign. If not enacted this year, the measure dies.
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