A low-carbon economy (LCE), low-fossil-fuel economy (LFFE), or decarbonised economy is an economy based on low carbon power sources that therefore has a minimal output of greenhouse gas (GHG) emissions into the environment biosphere, but specifically refers to the greenhouse gas carbon dioxide. GHG emissions due to anthropogenic (human) activity are the dominant cause of observed global warming(climate change) since the mid-20th century. Continued emission of greenhouse gases will cause further warming and long-lasting changes around the world, increasing the likelihood of severe, pervasive and irreversible impacts for people and ecosystems.