Dozens of nations sign U.N. ocean treaty, implementation still awaited

The treaty aims to protect oceans from overfishing and pollution.
At least 60 countries signed the agreement, but it still needs national ratification.
The treaty will create protected areas, ban fishing in some zones, and require environmental reviews.
Experts see the treaty as key to meeting the 2030 goal of safeguarding 30% of land and sea.
The agreement faces hurdles before taking effect, including U.S. opposition.