Ecological Engineering Methods is when researchers try to tap biologically-based energy sources. Some projects include engineering new organisms that produce hydrogen from water and sunlight in environmentally friendly ways with no waste products, and transforming the way man interacts with the environment. One of the more familiar techniques of ECO- Engineering is Bioremediation. Using oil-eating bacteria created by Eco-Engineering, Bioremidiation is applied to oil/chemical spills worldwide.We have to distinguish between Primary and Secondary methods of producing energy. Making hydrogen from water by electrolysis will use more energy than is available in the hydrogen, because processing always has nonzero wastage. When the hydrogen is produced there are all the emissions for generating electricity from fossil fuels for electrolysis, but when the hydrogen is used in automobiles as fuel the automobiles will emit harmless water vapour.

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