Anton Petrov's material, concerns a new discovery indicating that the planets Venus and Jupiter significantly affect Earth's climate through the mechanism of the Milankovitch cycle. Specifically, the gravitational influence of the two planets changes the eccentricity of Earth's orbit every 405,000 years or so, leading to major climate changes (e.g., warmer summers and colder winters). Scientists have found that this cycle has been remarkably accurate over the past 215 million years, and its effects are natural and long-term, although they do not discount the impact of short-term climate changes caused by humans.