How do human activities alter global biogeochemical cycles?

Human activities significantly disrupt natural biogeochemical cycles through practices like burning fossil fuels, using synthetic fertilizers, and changing land use. These interventions release stored elements into the atmosphere and alter water flows, contributing to climate change, pollution, and the intensification of the water cycle. Anthropogenic inputs have particularly transformed cycles such as carbon and nitrogen, altering long-term environmental balances.

What we know

• Human activities such as burning fossil fuels release stored carbon back into the atmosphere. [2]
• Agricultural and industrial nitrogen inputs to the environment currently exceed natural nitrogen fixation rates. [5]
• Human actions like deforestation, urbanization, and groundwater extraction significantly affect the natural water cycle. [4]
• Human activities account for over one-third of global nitrous oxide emissions. [5]

Where to go next

• the bigger pictureWhat is the nitrogen cycle?
• how it workedHow does the Haber-Bosch process work?
• what followedWhat causes climate change?
• what caused itHow does deforestation affect the water cycle?
• a case in pointWhat are marine biogeochemical cycles?
• an unexpected connectionHow does fertilizer production connect to ozone depletion?Synthetic fertilizers created through industrial processes drive nitrogen inputs that elevate global nitrous oxide emissions, which act as both a greenhouse gas and an ozone-depleting substance.

Sources

• [1]biogeochemical cycle (Wikidata Q846303) · CC0 1.0
• [2]Biogeochemical cycle · CC BY-SA 4.0
• [3]Marine biogeochemical cycles · CC BY-SA 4.0
• [4]Water cycle · CC BY-SA 4.0
• [5]Human impact on the nitrogen cycle · CC BY-SA 4.0