%u201CIn photosynthesis, plants %u2018breath%u2019 in carbon dioxide from the atmosphere and, with sunlight energy, convert it and water into food and oxygen, which they then %u2018exhale,%u2019%u201D explained co-author Joe Berry from the Carnegie Institution%u2019s Department of Global Ecology. %u201CIn ecosystems, plants and other organisms respire producing carbon dioxide.