|Solar energy powers all life processes on Earth|
The video begins by exploring climatic relationships among biomes through climatographs. It then moves to a discussion of the light and dark reactions of photosynthesis and how these processes are used in producing living biomass. It next considers the laws of thermodynamics and how these constrain energy flow through ecosystems. Concepts relating to productivity are then reviewed, as is the transfer of energy through trophic levels. The video concludes by following energy from primary producers to consumers to decomposers.