What are the long-term natural cycles that regulate CO2 levels in Earth's atmosphere?

Jan 15, 2025 ... The average global atmospheric CO₂ concentration has increased by almost 20 percent since 1990, and set a record high in 2022. The enhancement of the CO2 mole fraction in the atmosphere over pre-industrial is expressed both as ppm and as a percentage change since the year 1800. Data ... Feb 2, 2020 ... Their results showed that 2.7 billion years ago, carbon dioxide comprised at least 70 percent by volume of Earth's atmosphere. Assuming the Sun ... Sep 4, 2020 ... The ocean is a sink for ~25% of the atmospheric CO2 emitted by human activities, an amount in excess of 2 petagrams of carbon per year (PgC ... Oct 21, 2024 ... It represents the largest carbon exchange between land and atmosphere on the planet. GPP is typically cited in petagrams of carbon per year. One ... Jan 2, 2023 ... Some researchers believe that approximately 0.045% by volume is the maximum more or less acceptable concentration of CO2 in the atmosphere. Sep 16, 2019 ... CO2 Makes Up Just 0.04% of Earth's Atmosphere. Here's Why Its Impact Is So Massive ... Reader question: I heard that carbon dioxide makes up 0.04 ... Dec 7, 2023 ... Today atmospheric carbon dioxide is at its highest level in at least several million years thanks to widespread combustion of fossil fuels ... ... percent of fossil-fuel emissions stay in the air. From climate.nasa.gov. © NASA. If we split our atmosphere today into 1 million parts, 421 of them would be ... The table also gives the percentage of the atmosphere composed of the gas. Object. Mass. (kilograms). Carbon. Dioxide. Nitrogen Oxygen Argon Methane. Sodium.