Place the following energy sources in order of their least net carbon dixide emission into the atmosphere, where 1. = lowest net carbon, and 5. = highest net carbon. in your calculation, take into account: how much carbon dioxide (or co2 equivalent) is emitted per unit energy generated. if the source is renewable, how much carbon dixide (or co2 equivalent) is removed from the atmosphere each year by that resource. how much energy is needed to produce and deliver that energy source. biodiesel (algae-based) nuclear biochar sequestration (produced by torrefaction or pyrolysis). biogas (recovered biogenic methane [landfills, livestock waste]) pyrolysis (biomass gasification)