B33.(IF ENERGY OR FUEL) From the following list, indicate the ONE ENERGY SOURCE that involved the largest proportion of your energy-related work during the past year.
Mark (X) one
1 [ ] Coal
2 [ ] Petroleum and natural gas
3 [ ] Nuclear fission
4 [ ] Nuclear fusion
5 [ ] Hydroenergy
6 [ ] Other Renewables (such as solar, biomass, wind, geothermal)
7 [ ] Other energy source ? Specify: ________________________________________