But non-renewable resources generate harmful ... we need to look for ways to make renewable and sustainable energy resources. For example, wind, solar and hydro energy. These are just some of ...

Whilst for bioheat, for example, the origin is ourselves ... replaced the conventional 2-tier renewable and non-renewable energy sources classification.” This content is protected by copyright ...

for example, are such sources that are constantly being replenished. Renewable energy sources are plentiful and all around us. Fossil fuels - coal, oil and gas - on the other hand, are non ...