What are good points for solar?

It is the primary source of energy on earth in the first place and it doesn't emit or cause transfer of CO2. It doesn't involve combustion thus no smog or aerosol that would cause Urban Thermal Island effect.

In fact, when we speak about using Biofuel, it is the indirect use of Solar energy using plant as energy transformer an stored in chemical energy. Our existing fossil fuel is also the long path of indirect use of Solar energy. This also imply, for the limited area, direct Solar energy usage would yield the maximum amount of energy harvested in an unit area.