Non-Combustion Energy

I posted this in the wrong place by accident so I'm reposting it here:


There's been a lot of interest in biofuels, but I still see a problem with them. The burning of any carbon based fuel creates atmospheric pollution. I don't know if there is anything that can be burned or digested that doesn't release gas and/or particulate matter into the atmosphere. Gaseous water is also a greenhouse gas. So we need to think twice about fuel processes that release water vapor too.

What about electricity generation without combusting anything? I know there are people working on things like making sterling engines more efficient. There's a company called Matteran Energy that has been working on using low temperature thermal energy (70 degrees and lower) to generate electricity. Of course, there is solar PV, wind power, and water hydroelectric power. I find solar tower updraft energy interesting, but not applicable to home generation in many cases.

What other non-combustion, zero emissions energy generation processes are there?

It has always amazed me that no one ever put generators at the Golden Gate. There is enough avaliable energy there to supply most of Southern California and it would have almost no effect on fish or wildlife.

DaS Energy for some years has been occupying its time in devolping new means out of old.

The most simpliest of these is a turbine active by use of any liquid inclusive of CO2.
CO2 giving the highest Kw output.
A one litre turbine heated 100*C rotating at 60 RPM provides 720 Kw,  lesser heat lesser Kw down to an operaturing temperature of minus 10*C . 
Wattage output is calculated by 1 litre flow per second at 9 bar prssure through the turbine produces 720 watts.
Other liquids including Ether and Ethonal require less strength of pipe.
The device including the turbine can be completely home built so long as one can cut and weld pipe.

http://i1225.photobucket.com/albums/ee397/DaSEnergy/DaSvalve.jpg

There is a point where greenhouse becomes a buzzword used for nefarious purpose.
The opposite of greenhouse would be a martian landscape and earth without icecaps would be paleolithic again.
There is a balance to be had in everything, extremes in either direction are not helping anything.