单选题 The input of solar energy supplies 99 percent of the energy needed to heat the earth and all buildings on it. How is this possible? Most people think of solar energy in terms of direct heat from the sun. However, broadly defined, solar energy includes direct energy from the sun as well as a number of indirect forms of energy produced by this direct input. Major indirect forms of solar energy include wind, hydropower, and biomass--solar energy converted to chemical energy in trees, plants, and other organic matter.
3. It can be inferred from the passage that the author most likely believes which of the following about solar energy?