Being an Air Pollution Scientist, I work on all kinds of Power Plants that produce any kinds of emissions that need to be quantified.
Of course we all know that any fossil fuel fired power plant produces CO2 at a direct ratio of the amount of fuel burned and carbon content of fuel.
The problem lies in some of these other "renewables" and Fuel Cell power producers.
The Fuel Cell facility shown on the page before erroneously says "zero pollution". Every fuel cell facility of any size uses Natural gas as a fuel, so still produces CO2 at near the same level of any other natural gas burning power plant. If the used pure Hydrogen as a fuel, then it would not produce any CO2 emissions, but pure hydrogen is far too expensive to fire in any of these systems.
I do a lot of renewable energy fired power plants, they all produce Huge amounts of CO2 emissions, why?
Because they are burning either landfill gas, digester gas, wood, sh#t, or any other kind of carbon rich fuel.
So these new power sources are good in many ways, since it's better to burn landfill gas than let it emit into the atmosphere uncontrolled,
but to forget they still emit as much CO2 as any other fossil fuel (Coal emits more CO2 than any of these renewables) is misleading.
ETHANOL from corn takes as much energy to make as you get out of it.
Also not true. This was the calculation, early on, when it was not known to calculate side benefits, such as using using the leftovers for feed. However, the original wrong calculation (by David Pimental, I think) has an eternal life on the internet.