The world is in danger, because the polution in the earth absorb the infrared lightings, and it cause more deegres of temperature, and this create natural disasters.
The film "uncomfortable truth" it is of this, it expalne this very good, and it's ideas are very clare. The earth is transformate, it's more hotter than the other years, the temperature stand up.
This is provocated by the polution of the cars, the factories, etc. the particules joined with the ozon layer, and do it more heavy and thicknes, and when the infrared lighting come to the earth, this bounce, and this create heat, at the end it have to exit, but with the polution it cannot, and in finaly it absorb the lightin.
Credits: the altavista's traductor, http://www.altavista.com/, the text of the book, the film, "uncomfortable truth" and the google images