The world's first international treaty to protect the high seas is due to be adopted Monday at the United Nations, a historic environmental accord designed to protect remote ecosystems vital to mankind. The landmark treaty will establish a legal framework to extend swathes of environmental protections to international waters, which make up more than 60 percent of the world's oceans. Following more than 15 years of discussions, including four years of formal negotiations, UN member states finally agreed on the text for the treaty in March after a flurry of final, marathon talks.