Basically, it returns carbon that was slowly extracted and set aside for million of years, adding to the quantity of carbon in the atmosphere.
Moreover, fossil fuel often contains traces of other chemicals, sulfur notably, that would react to form acid once it is burned. That acid does have an effect on sensitive ecosystems.
Technically speaking, everything we do will have an impact on ecosystems. When does the impact turns to harm is the subject of many debates, with very opinionated people on either sides.
So, there is no clear cut answer, although there is a larger consensus that we do harm the ecosystems.Auto Answered|Score 1Weegy:
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Many activities disrupt ecosystem balance. For example, global warming is the result of ... Examples are: The use of fossil fuels, construction, hunting, burning toxins, and ...http://wiki.answers.com/Q/What_are_some_human_activities_that_disrupt_the_balance_of_the_ecosystemAuto Answered|Score .4768
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