Argentina and Uruguay have agreed to a joint environmental monitoring program along the shared Uruguay River, ending a seven-year pollution controversy over a Finnish paper mill on the Uruguayan side...The agreement...calls for setting up a joint-scientific committee in 30 days to begin the monitoring work...Argentina hopes the accord will appease environmentalists who for three years have blocked a bridge linking Gualeguaychu to Fray Bentos, in Uruguay, where the UPM mill was built seven years ago over Argentina's objections that it would pollute the river...The monitoring committee is to check for pollution in all farming, industrial and urban centers that spill their waste into the Uruguay river and its tributaries, starting with the UPM plant in Fray Bentos.