Use of agricultural chemicals such as fertiliziers have magnified it. All of us aware of pesticides and herbicides which are basically chemical preparations to kill fungal and animal pests.
These pesticides can be carried into aquatic environments by run off while wind can carry them to other fields, grazing areas, human settlements and undeveloped areas, potentially affecting other species.
Each pesticide or pesticide class has their own set of environmental concerns. Over time, pesticides have generally become less persistent and more species-specific, reducing their environmental footprint.
Pesticides can kill bees and are strongly implicated in pollinator decline.
Many kinds of animals are harmed by pesticides leading many countries to regulate pesticide usage through Biodiversity Action Plan