What has been the general trend of Earth's climate over the history of the solar system?

The general trend of Earth's climate throughout the history of the solar system is characterized by a gradual warming aligned with the increasing brightness of the Sun over geological timescales. As the Sun ages, it gradually increases in luminosity, providing more heat and energy to the Earth. This long-term trend has significant implications for climate, as it influences the temperature of the Earth's atmosphere and surface conditions over millions of years.

Additionally, while there have been periods of cooling and warming, such as ice ages and interglacial periods, the overarching trend is one of gradual warming due to the Sun's life cycle. This perspective accounts for the Earth’s long-term climate dynamics and highlights the influence of solar output on climate evolution, supporting the choice that describes this trend effectively.