Query: "Pollution; none of us are supporting putting substances into the  atmosphere or the waterways that might be pollutants, but carbon dioxide  is not a pollutant.

Relevant passages:
Air pollution <=SEP=> Air pollution occurs when harmful substances including particulates and biological molecules are introduced into Earth 's atmosphere . It may cause diseases , allergies or death in humans ; it may also cause harm to other living organisms such as animals and food crops , and may damage the natural or built environment . Human activity and natural processes can both generate air pollution .   Indoor air pollution and poor urban air quality are listed as two of the world 's worst toxic pollution problems in the 2008 Blacksmith Institute World 's Worst Polluted Places report . According to the 2014 WHO report , air pollution in 2012 caused the deaths of around 7 million people worldwide , an estimate roughly matched by the International Energy Agency .

Fossil fuel power station <=SEP=> A fossil fuel power station is a power station which burns fossil fuel such as coal , natural gas , or petroleum to produce electricity . Central station fossil fuel power plants are designed on a large scale for continuous operation . In many countries , such plants provide most of the electrical energy used . Fossil fuel power stations have machinery to convert the heat energy of combustion into mechanical energy , which then operates an electrical generator . The prime mover may be a steam turbine , a gas turbine or , in small plants , a reciprocating internal combustion engine . All plants use the energy extracted from expanding gas , either steam or combustion gases . Very few MHD generators have been built which directly convert the energy of hot , moving water into electricity . MHD means Magnetohydrodynamics , which is the study of the magnetic properties of electrically conducting fluids . Examples of such magnetofluids include plasmas , liquid metals , salt water and electrolytes .   By-products of thermal power plant operation must be considered in their design and operation . Waste heat energy , which remains due to the finite efficiency of the Carnot , Rankine , or Diesel power cycle , is released directly to the atmosphere or river/lake water , or indirectly to the atmosphere using a cooling tower with river or lake water used as a cooling medium . The flue gas from combustion of the fossil fuels is discharged to the air . This gas contains carbon dioxide and water vapor , as well as other substances such as nitrogen oxides ( NOx ) , sulfur oxides ( SOx ) , mercury , traces of other metals , and , for coal-fired plants , fly ash . Solid waste ash from coal-fired boilers must also be removed . Some coal ash can be recycled for building materials .   Fossil fueled power stations are major emitters of carbon dioxide ( CO2 ) , a greenhouse gas which according to a consensus opinion of scientific organisations is a contributor to global warming . The results of a recent study show that the net income available to shareholders of large companies could see a significant reduction from the greenhouse gas emissions liability related to only natural disasters in the U.S. from a single coal-fired power plant . However , as of 2015 , no such cases have awarded damages in the U.S. Per unit of electric energy , brown coal emits nearly two times as much CO2 as natural gas , and black coal emits somewhat less than brown . Carbon capture and storage of emissions is not currently available .

Pollution <=SEP=> Pollution is the introduction of contaminants into the natural environment that cause adverse change . Pollution can take the form of chemical substances or energy , such as noise , heat or light . Pollutants , the components of pollution , can be either foreign substances/energies or naturally occurring contaminants . Pollution is often classed as point source or nonpoint source pollution .