Among the goals is a "zero tolerance policy" toward future invasions by foreign species, including the Asian carp, a huge, ravenous fish that has overrun portions of the Mississippi River system and is threatening to enter Lake Michigan. Others include cleanup of the region's most heavily polluted sites, restoring wetlands and other crucial habitat, and improving water quality in shallow areas, where runoff from cities and farms has led to unsightly algae blooms and beach closings. Also promised is a strategy for monitoring the ecosystem's health and holding federal agencies accountable for carrying out the plan. During his 2008 campaign, U.S. President Barack Obama pledged $5 billion over a decade toward fulfilling a Great Lakes cleanup wish list developed by a coalition of agencies, scientists and activists.