Explain how sources of energy for society have changed over time.Be sure to include both the timescale of this figure as well as likely energy sources prior to 1860. 
Definitions:
Operant
Pertaining to operant conditioning, a method of learning that employs rewards and punishments for behavior, leading to changes in that behavior's frequency.
Systematic Desensitization
A therapeutic intervention aimed at reducing an individual's anxiety responses through gradual exposure to the feared object or situation, along with relaxation techniques.
Relaxation Training
A therapeutic technique designed to help individuals learn to reduce stress and anxiety through specific physical exercises and controlled breathing.
Assertiveness Training
A behavioral therapy technique designed to help individuals clearly and confidently express their needs and rights without infringing on the rights of others.
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