Modified carbon nanotubes can store solar energy indefinitely, then be recharged by exposure to the sun.
Storing the sun's energy in chemical form--a new "green" energy solution. Researchers have done it before, but either the chemicals used to store the energy were very expensive or broke down quickly. MIT is using carbon--readily available and inexpensive--in its current research.
S.07.PS.05b Assess the environmental impact of energy resources.