Hello @bunnypuncher.
¿Is global warming a problem?
Of course because every day our ozone layer weakens more what the ultraviolet rays do, pass more quickly causing havoc on the planet, and therefore to people, who are affected by the incidences of the sun.

¿Is it real or simply exaggerated by governments and corporations?
It is real, simply that the effects or collateral damage caused by large industries are not corrected with real hardness, by the emission of carbon dioxide has accelerated the weakening of the ozone layer.
¿ Are we causing it or is it just a natural temperature cycle of the earth?
It is a temperature cycle, due to the climatic changes that have been originating, causing the sun to penetrate into a greater proportion the solar radiation, but also with the increase of industries that prefer not to reduce their production or lower costs, generating more pollution every day To the environment.