In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: The total mass of the biologically active form of this element has doubled since the beginning of the 20th century and an overabundance of it has been shown to reduce biodiversity. One of its oxides is an extremely effective greenhouse gas and can catalyze ozone destruction in the stratosphere, while another of its oxides serves as a fuel for the production of tropospheric ozone. Biologically active forms of it are produced naturally by lighting and certain types of bacteria, who "fix" it. It is mostly inert due to the very strong bond between its atoms as a diatomic gas. FTP, name this element, the most abundant in the atmosphere.
A:
Science