Chelsea holds a B.F.A. from the Maryland Institute, College of Art (2005) and an M.A.T. from Johns Hopkins University (2011.) In addition to cartooning and being a first-time mother, she has worked as an elementary school art teacher.
The concept of primary energy is used in energy statistics in the compilation of energy balances, as well as in the field of energetics. In energetics, a primary energy source refers to the energy forms required by the energy sector to generate the supply of energy carriers used by human society.
Fuel wood is the main energy source for cooking for most of the developing world, and is the primary source of energy for over 2 billion people. Solar and wind power have both experienced explosive growth over the past decade, but both still account for a very small portion of the world's energy.