The main cause of air pollution is industry, which can includechemical production, pharmaceuticals, and energy plants. The secondmajor source is raising cattle for beef. It has actually surpassedthe amount of pollution caused by cars.The Government's involvement in pollution reduction varies fromcountry to country, but generally it involves incentive programs,fines, and restrictions. The success of these programs variesgreatly, and sometimes cannot be implemented at all. For instance,if a government finds that a particular industry produces "x"amount of emissions, they may sign laws stating that this quantitymust be reduced by 20% or else the company will be fined. In manycases the industry may find that it is more profitable to pay thefine than meet the new standards, so no change takes place. In thesame situation an industry may meet the new standard only todisplace the emissions in an alternate, equally harmful way, suchas dumping in unrestricted locations (outside of lawful governmentcontrol) or producing separate industry (like having a factory thatproduces filters, yet production of the filters itself causespollution). An even more likely condition is that the industrysuccessfully prevents any government involvement through thestrength of legal maneuvering. Books can and have been writtenabout the battle between environmental groups, industry lobbyists,and government bodies on the topic of pollution regulation. Howmuch is actually done to untangle the bureaucracy usually restswith public support.