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Positive efects?
what are these positive effects you speak of?
Who is responsible for the diversity of wildflower meadows? Who is responsible for maintaining ancient woodlands?
Who started to promote national parks? Who regulates access to wilderness areas?
Who is creating wildlife corridors to enable species to adapt?
None of these are natural functions, they are all managed by man.
Lead mining in the dales of Derbyshire and Yorkshire has left its own heritage. The damming of many rivers and streams to power waterwheels has created a diverse environment for fish, birds and small mammals The diversity of woodland, scrub and meadow wildflowers supports populations of butterfly, moths and other invertebrates. The old dew ponds origianlly made for livestock now support rare newts.
The use of different grazing animals, sheep, cattle and ponies all provide a variety of habitats suitable for wild orchids and other rare plants.
None of this is natural, if the sites were not managed they would return to monoculture wilderness.