Of the first variety, injecting sunlight-reflecting sulphate aerosols into the upper atmosphere is a relatively cheap, easy and quick option.

对于第一种方式，在上层大气注入阳光反射硫盐酸气溶胶是一个相对便宜、简单、快捷的选择。

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Any effect from modern changes in solar activity is likely to be dwarfed by greenhouse gas emissions and associated issues such as sulphate aerosols.

近现代时期，和温室气体及硫酸盐气溶胶相比，太阳活动的影响更是相形见绌。

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Other techniques aim to enhance marine cloud reflectivity by introducing sea salt aerosols in low clouds, mimic the effects of volcanic eruptions by injecting sulphate aerosols into the lower stratosphere, or place shields or deflectors in space to reduce the amount of incoming solar radiation.

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Another, which would oppose warming, is a rise in the quantity of sulphate-based aerosols, which encourage cloud formation and thus cool the air by reflecting sunlight back into space.

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Another issue is that a second type of pollutant, aerosols such as the minute sulphate particles that form when sulphurous fuel is burned, promote the formation of clouds.

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