This is an excellent video describing how we are manipulated by the media and politicians.  It traces the roots of the psychology used by such people as Edward Bernays who wrote the book Propaganda and the use of the term ‘manufacturing consent’.

Manufacturing consent is the basis of all propaganda used against us today, it uses group psychology to get the majority to agree to something that they would not normally agree to, peer pressure in fact.

Whenever you hear the term ‘consensus’ used by politicians, that is manufacturing consent in practice. You hear it a lot in the global warming debate in order for the public to stop thinking critically about the complex issues involved and go along with whatever the media and politicians would have us believe. Manufacturing consent is diametrically opposed to critical thinking and discernment.