Nuclear fission is a present-day technology, not a future technology; you must have meant fusion. Biomass is a viable technology, with large-scale biodiesel plants coming online in Europe, the UK, and if I'm not mistaken, in the US.
I consider myself an expert on:
Wind; spent a year doing engineering design and financial projections for a utility-scale wind project, including design of wind survey, design of improved survey equipment, evaluation of turbine types, logistical planning for construction, evaluation of equipment & methods, business plan development and writing, spreadsheets for five-year projections, etc. etc.
Energy efficiency technologies; most clearly with regard to telecommuting infrastructure, which counts because it directly takes cars off the road. I'm a telecoms engineer, have been in the field for 20+ years. For more, see
www.cooperative-digital.com, click on the link for telecommuting, and click the sub-links for the pages within the telecommute section. Yes, I wrote all that:-). I also designed the OutRoute feature for telecommuters, which has been adopted by Panasonic as part of the firmware in its new-generation KXTDA telephone switches and KXTVS voicemail units.
Waste management; extensive background study and practical design for solid waste recycling, waste-to-energy, and municipal composting systems for small-town developments. Design & implementation of curbside recycling in a small northeastern town. Original equipment designs for source-separation technologies. Etc.
Experience or good working knowledge though not at expert level:
Involvement in a 2-year project to evaluate sustainable energy technologies, including evaluation of claims related to "zero point energy" devices (I've already posted my results & opinions on *that* topic in a number of places on this site, quick summary is that the ZP theory is interesting as pure science, but no reliable & replicable ZP technologies were observed.)
Decent layperson's knowledge of nuclear fission. In fact in college during the Three Mile Island incident I gave a couple of mini-lectures about why it was unlikely that the plant would suffer a catastrophic radiation release, and that was at a time when I was opposed to nuclear power due to the issues around nuclear waste management. (Needless to say I've long since decided that climate change is a far more significant issue, and have been supporting nuclear power strongly as a result.)
Decent layperson's knowledge of general science & engineering, and a geek mindset to go with it!:-)