People, Development and Environment
9.21
Our Energy Sources
Energy is the ability to do work or cause change. It’s fun-
damental in nature.
For examples, radiant energy from the sun warms
Earth. Cars use mechanical energy from fuel. We use elec-
trical energy to charge phones.
1.
Conservation Law:
Energy can’t be created or
destroyed, only changed in form. This is key to under-
standing energy dynamics.
2.
Energy in Society:
Essential for food and water secu-
rity, development, and climate adaptation. The pro-
duction and use may become part of anthropogenic
activities.
3.
Shift to Renewables:
Moving from natural to human- ...
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