Tidal salt marshes occur in protected, low-energy coastal areas such as estuaries, lagoons, bays and river mouths, and grade into brackish and freshwater marshes where there is significant river flow. The historical loss of tidal wetlands and the goal of "no net loss" of wetlands proposed by former President George Bush have resulted in increased interest in restoration and creation of tidal marshes. Marsh restoration and creation are often used for mitigation to compensate for wetland loss. Nitrogen inputs via N fixation are greater and N losses via denitrification are lower in restored marshes. Careful site selection is important for increasing the probability of success of tidal marsh restoration and creation projects. Techniques for restoring or creating tidal marsh habitat have been developed and applied in many locations with varying degrees of success.