Non-renewable sources are generally more polluting than renewable sources.
However, renewables can be visually polluting eg large solar or wind farms.
In LEDCs, clearing of vegetation (biomass) for energy releases CO2 and can increase the risk of flooding and lead to desertificaion.
Transport of non-renewables is also a problem. For example, transportation of crude oil.
Oil is shipped in large tankers which can have huge envirnomental impacts if a spill occurs ( eg: Deepwater Horizon in 2010) .
Renewable sources can often be used on much smaller scales eg: mini HEP schemes in Nepal.
These provide enegy for small villages and produce no carbon emissions.
Many HEP schemes though are large scaled operations eg Three Gorges Dam, China.
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