concept

carbon dioxide concentration

Also known as: carbon dioxide concentration, carbon dioxide concentrations, CO2 concentration

Facts (10)

Sources

ESS Subtopic 6.2: Climate change – Causes and Impacts mrgscience.com mrgscience.com 4 facts

measurementThe IPCC's Sixth Assessment Report (2021) reports that carbon dioxide concentrations have reached levels not seen in at least 2 million years, with current levels exceeding 400 ppm.

referenceRockstrom et al. proposed planetary boundaries for climate change, including a carbon dioxide concentration objective of 550 ppm for 2100 and 350 ppm for 2100.

measurementCarbon dioxide concentrations have increased by 48% since pre-industrial times, largely due to human activities.

claimThe IPCC asserts that human activities, primarily through fossil fuel combustion and deforestation, are unequivocally responsible for the increase in carbon dioxide concentrations.

An In-Depth Analysis of the Photosynthesis Process, Its Mechanisms ... publishing.emanresearch.org Ibrahim B. E. El Bashir, Loiy Elsir Ahmed Hassan, Sakina Yagi · Australian Herbal Insight 2 facts

claimC4 plants display a higher photosynthetic efficiency in lower carbon dioxide concentrations compared to C3 plants.

claimIncreased light intensity and carbon dioxide concentration significantly elevate the rate of photosynthesis in both C3 and C4 plants.

The Ecology of Photosynthetic Pathways | Learn Science at Scitable nature.com Nature 2 facts

claimC4 plants possess a photosynthetic advantage over C3 plants in conditions of high photorespiration, such as low carbon dioxide concentrations or high temperatures.

formulaTranspiration efficiency (A/E) is calculated using the formula: A/E = (Ca - Ci)/1.6 (VPa - VPi), where Ca is ambient CO2 concentration, Ci is intercellular CO2 concentration, VPa is ambient vapor pressure, and VPi is internal leaf vapor pressure.

Climate change: evidence and causes | Royal Society royalsociety.org The Royal Society 1 fact

claimObserved atmospheric temperature changes show a pattern that is much closer to the fingerprint of a long-term increase in CO2 concentration than to the fingerprint of a fluctuating Sun alone.

Dozens of scientists push back on 'fundamentally ... - ABC News abcnews.com ABC News Sep 3, 2025 1 fact

claimBecca Neumann acknowledges that the effect of higher carbon dioxide concentrations enhancing photosynthesis and boosting crop yields is real and well-documented, but notes that this effect is already factored into the climate and agricultural models that the Department of Energy (DOE) report seeks to discredit.