Balance is harmony between opposing forces.
Opposing forces will grow in one direction or another depending upon the amount of attention fed to them through feedback loops.
The earth-atmosphere energy balance is achieved as the energy received from the Sun balances the energy lost by the Earth back into space. This balance is how our Earth maintains a stable average temperature and therefore a stable climate.
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03.03.2020 / NASA / Real World: Earth’s Energy Balance – Energy In and Energy Out