Sulfur itself is not a green house gas. However, when it combines with other elements, such as fluoride or carbon it can be transformed into a very noxious substance that is harmful to the planet. Two examples are Sulfur hexafluoride and Sulfur Dioxide. Sulfur hexafluoride although released in small quantities than other gases packs a more powerful punch of global warming compared to carbon dioxide to a tune of 24,000 times. Also, sulfur dioxide creates acid rain and can create health problems.
Just to add to these wonderful answers, sulfur can have a cooling effect on the planet. When volcanoes release volcanic ash, i.e., sulfur/sulfur dioxide, into the atmosphere, global temperatures can, and do, drop. Sulfur particles block the energy and radiation from the Sun and thus cool the Earth.
Following the massive eruption of Mt. Pinatubo in 1991, global temperatures dropped about .5 degrees Celsius.
Scientists have actually entertained the idea of injecting the atmosphere with sulfur to mimic the effects of a volcanic eruption, which lowers the Earth’s temperature.
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