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While both of these geoengineering examplestiffany rings might counter global warming for a time, they could also have significant drawbacks. Increased fertilizers and/or phytoplankton growth could have unintended consequences on ocean ecosystems, including increased ocean tiffany braceletsdead zones and toxic blooms. Adding aerosols to the upper atmosphere could modify the chemistry of the upper atmosphere, affecting ozone and thereby having possible unintended impacts on the lower atmosphere.