Organisms can be further classified by ultimate source of their energy: photoautotrophs and photoheterotrophs obtain energy from light, whereas chemoautotrophs and chemoheterotrophs obtain energy from inorganic oxidation reactions.
Critical to all artistic considerations was the belief that the energy and rhythm generated in artistic practice allied the practitioner with the ultimate source of that energy, drawn forth from earthly and heavenly sources and from the sacred Dao itself.
Steps are being taken worldwide to reduce emissions but since we humans are likely to carry on defecating for many years to come, human poo could be considered the ultimate source of renewable energy.
The Sun is the ultimate source of most renewable energy resources with solar energy representing a substantial opportunity for use as the foundation of any renewable-based support system.
It is, after all, the ultimate source of almost all the energy on the planet, and thereby all the planet's life.
In plants the ultimate source of all organic chemicals and the energy stored in their chemical bonds is the conversion of CO2 into organic compounds (CO2 fixation) by either photosynthesis or chemosynthesis.
