Here are some useful articles relating to pros and cons of renewable energy
General:
http://www.conserve-energy-future.com/pros-and-cons-of-renewable-energy.php
http://alternativeenergy.procon.org/view.resource.php?resourceID=001792
http://www.greenworldinvestor.com/2011/04/04/pros-and-cons-of-renewable-energy-a-detailed-explanation/
Solar Energy :
http://www.conserve-energy-future.com/category/solar-energy
Wind energy:
http://www.conserve-energy-future.com/category/wind-energy
http://www.altenergy.org/renewables/wind.html
Geothermal Energy :
http://www.conserve-energy-future.com/category/geothermal-energy
http://energyinformative.org/geothermal-energy-pros-and-cons/
Biomass
http://www.conserve-energy-future.com/pros-and-cons-of-biomass-energy.php
http://energyinformative.org/biomass-energy-pros-and-cons/
Tidal:
http://energyinformative.org/tidal-energy-pros-and-cons/
http://www.renewablegreenenergypower.com/tidal-energy-tidal-power-pros-and-cons/
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