Question of the Week: Solar energy

(CNN) -- The first forays in solar technology began in the 19th century, yet today solar power remains on the fringes of society in terms of how much it serves our energy needs.

Solar power is said to be the one of the cleanest and most efficient energy sources there is, yet we use so little of it.

According to the International Energy Agency, solar power's contribution to the global energy supply is only 0.039 percent.

Question: Why do you think solar power makes up such a small percentage of our energy use? E-mail us at ecosolutions@cnn.com E-mail to a friend