<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">greenhouse gases</topic></authority><related type="other"><topic>greenhouse effect</topic></related><related type="broader"><topic>environmental concepts</topic></related><variant type="other"><topic>greenhouse gas</topic></variant> <note xml:lang="en"><![CDATA[ Gases that contribute to the greenhouse effect, including water vapor, carbon dioxide (CO2), methane (CH4), ozone (O3), nitrous oxide (N2O), hydrofluorocarbons (HFCs), halogenated fluorocarbons (HCFCs), and perfluorinated carbons (PFCs). ]]></note></mads>