Overall solar energy has no direct Green House Gas emissions from its energy generation, however the production of the materials of solar panels are energy intensive. (Jeremy Moss et al, 2014) Comparatively, energy generation between solar panels and fossil fuels like coal and gas are simply cleaner under solar panels with a study conducted in 2008 producing the following findings.
(Source: Akella et al, 2008)
Overall solar energy generation is almost a 10 th in terms of carbon dioxide and a much lesser fraction of sulphur dioxide and nitrogen oxides. However, as the environmental impact is largely associated with the production of solar panels, longevity of the panels decreases the environmental impacts significantly.