First, fusion's only bi-product is hydrogen, which cannot be
radioactive (Its atoms aren't big enough to be unstable)-
however, after billions of dollars of research, we've failed to
produce 1kw from the thing. The risk from nuclear powerplants
isn't too bad if we take necissary precautions (like using
deionized H2O instead of molten Na metal for the cooling
process), and it's likely to be used more extensively in the
future (the earth's supply of uranium is nearly limitless - not
to mention the tons of radioactive materials in space). Biomass
is using alternative fuels that come from plants (mostly corn).
Solar power is clean, but not very efficient (or cheap). The
most expensive part of solar energy generators, are the actual
panels (or mirrors, depending on the process). Instead, I
propose that it is actually possible to use plants to produce
harnessable energy through photosynthesis. The science checks
out - H2O + CO2 + Solar Energy => C6H12O6 + 02 (photosynthesis).
C6H12O6 + O2 => CO2 + H20 + Free electr