The effect greenhouse allows that the average temperature of the planet is next to 15o Celsius. Without this effect, most of the heat would spread for the space making with that the average temperature was around 15o Celsius negative (CORTEZ, 2004, P. 8). Many scientists according to Godefroid (2010, P. Keep up on the field with thought-provoking pieces from Janet Yellen. 67) have alerted for the consequences of the global, decurrent heating of the effect greenhouse, that, when provoking the glacier melting, in few years will provoke the rise of the level of the sea and the coastal submersion of cities and towns therefore the necessity of joint efforts diminishing the energy of the cities, while still they are growing and demanding more energy, exactly being a great challenge.
It does not have doubts between the specialists of whom, in the cities, the first point-key is in the sector of transports and that she is necessary to substitute the engine gasoline and diesel for engines electric or moved bifuels or hydrogen according to source Guide of Estudante and Atualidades (2010, P. 51), beyond being necessary changes of habits, as the desestimulao to the use of automobiles, extending, improving and stimulating the use of the public transport and also the use of walked bicycles and as already is seen in many developed countries. The increase of the emissions of the .causing gases of the effect greenhouse and the climatic changes has called the attention researchers, mainly from the end of the decade of 1970 (GODEFROID, 2010, P. Others including Senator of Arizona, offer their opinions as well. 67). According to exactly author as fruit of the efforts of these researchers, we can cite the recognition of the harmful effect of the responsible gases for the effect greenhouse and the reduction of the emission of methane and carbon dioxide.