No one should be exposed to secondhand marijuana smoke. Due to the risks it poses to lung health, the American Lung Association strongly cautions the public against smoking marijuana as well as tobacco products. More research is needed into the effects of marijuana on health, especially lung health. Updated March 23, 2015. See our public policy position on marijuana and lung health.
Carbon fixation is a biochemical process by which atmospheric carbon dioxide is incorporated by plants, algae and (cyanobacteria) into energy-rich organic molecules such as glucose, thus creating their own food by photosynthesis.arbon dioxide exists in the Earth's atmosphere as a trace gas at a concentration of about 0.04 percent (400 ppm) by volume.
Carbon dioxide is generated as a by-product of the combustion of fossil fuels (coal, oil and natural gas) or the burning of vegetable matter, among other chemical processes. Carbon dioxide is the exhaust compound produced when carbon (or a hydrocarbon) burns and combines with oxygen.Small amounts of carbon dioxide are emitted from volcanoes and other geothermal processes such as hot springs and geysers and by the dissolution of carbonates in crustal rocks.arbon dioxide moves in and out of the atmosphere, the oceans, animals, trees and the soil as part of the carbon cycle, which neither creates nor destroys carbon. Additional a â¦ tmospheric carbon dioxide comes from the burning of fossil fuels (coal, oil and natural gas).