Decarbonisation is the term used for removal or reduction of carbon dioxide (CO2) output into the atmosphere. It is achieved by switching to usage of low carbon energy sources such as battery technology, hydrogen or solar/wind farms. It is about reducing CO2 emissions resulting from human activity, with the eventual goal of eliminating them. The 2015 Paris Agreement set an ambition to limit global warming to well below 2°C above pre-industrial levels and pursue efforts to limit it to 1.5°C - in part by pursuing net carbon neutrality by 2050. The substantial reduction of global greenhouse gas emissions (including CO2) will limit the increase of global temperature. In practice, getting to zero net emissions requires shifting from fossil fuels to alternative low-carbon energy sources.