Recommended links ecology-related:
Eco-Living Ive corresponded a couple of times with John Schinnerer - MA, Whole Systems Design
.Cultural & Ecological Designing. People - Place - Learning Integration.
(Found his site while browsing recumbent bikes, which seem to appeal to those less fettered by the bounds of convention).
Alternative Energy I have enough links on solar, alone, to warrant a separate page due to a job-related search.
When it comes to harnessing other "free" natural energies, that would otherwise go to waste, there is wind, water, (wave, tide, hydro-electric and good old water mills), plus geo-thermal.
Alternative fuels like hydrogen, ethanol, methanol etc. may warrant some attention, but I dont see moving the source of pollution from one area to another as an ideal solution. For example, re-charging a "zero emission" electric vehicle using hydro-electric energy makes sense in a way that using power from a coal-fired, sulphur-emitting power plant never can.
Windpower.org - Awesome Danish wind power site - lots of info.