iwhat are some not-so-well known alternative energy sources. google it and you don't find much. when i google alternative energy i usually get:
hyrdoelectric energy
photovoltaic energy
wind energy
geothermal energy
ethanol
biodiesel
biomass
tidal energy
hydrogen fuil cells
passive solar

besides that i know of:
microbial fuel cells
artificial photosynthesis
syngas
biogas

what else is there?

How does wind energy, tidal energy and solar energy relate to chemistry?

I am doing a report on alternative energy.......if you have any info on slar energy, hydroelectricity, geothermal energy, or tidal energy, it would be much appriecieted!!! im looking for websites, or online articles. i need to know how its gathered, if its renewable, posotive aspects to this energy source, negative a spects, primary uses of this energy source, is it more available in other parts of the world that others, is this energy source economical copared to fossil fuels, what impact it has on the enviroment, and is it a good alternative to fossil fuel.

THANK YOU!!!

Well the question says it all really, thanks x
p.s renewable energy resources are things like solar energy, tidal energy etc.