The only disadvantage I could think of would be price of equipment needed to produce energy from the source (i.e. price of solar panels)
I think the answer would be grass
The best reference to use will be AN ATLAS.
An atlas is a collection of maps. A map is a pictorial representation of an area of land or sea which shows all the physical features of that particular place. Many information about different places can be obtained from maps and these include the longitudes of different places.
