Energy from the sun that enters the Earth system does not leave.
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This is due to the process of energy transfer and transformations within the Earth system. When sunlight hits the Earth's surface, some of it is absorbed and converted into heat energy, which warms the planet. This heat energy can then be transferred between different components of the Earth system, such as the atmosphere, oceans, and land.
Some of this heat energy is also radiated back out into space in the form of infrared radiation, but a significant portion is trapped within the Earth system by greenhouse gases such as carbon dioxide and water vapor. These gases absorb and re-radiate the heat energy, effectively trapping it in the atmosphere and causing the planet to warm. This phenomenon is known as the greenhouse effect.
Therefore, the energy from the sun that enters the Earth system does not leave entirely, as it is continuously being recycled and redistributed within the system. This plays a crucial role in regulating the Earth's climate and supporting life on the planet.