As a reminder , it is much easierto preventtrash from getting into the rivers
Dohling ... fencing of streams at strategic stretches had been startedto preventdisposal of garbage into the rivers
Carelessness isleadsto trash - clogged rivers
rumors of wantingto createlandfills in the rivers
the thousands of boxescreatingtrash in the river
the rain(passive) caused byriver of trash
old structures and wallscausedaccumulations of trash near rivers
policieswould ... preventtrash from reaching the rivers
the danger to wildlife(passive) caused bythe danger to wildlife
other problems for ocean creaturescreatesother problems for ocean creatures
to the ocean , oil and gas into the water ... etcleadto the ocean , oil and gas into the water ... etc
the closure irrigation and the use of fossil fuels for transportation and pollution of industry causing global warmingtriggeredthe closure irrigation and the use of fossil fuels for transportation and pollution of industry causing global warming
to oceansleadto oceans
to various harmful diseasesleadsto various harmful diseases