CBO makes its estimates of potential output on the basis of data on capital, labor, productivity, and actual GDP; statistical and other modeling methods for assessing cyclical influences and long-term trends in the economy; and analyses of the economic effects of federal tax and spending policies.
The hydrologic cycle is driven primarily by I solar energy II mechanical energy from ECOLOGY 1 at Indiana State University
While evaporation from the oceans is the primary vehicle for driving the surface-to-atmosphere portion of the hydrologic cycle, transpiration is also significant. For example, a cornfield 1 acre in size can transpire as much as 4,000 gallons of water every day.