Ações de antropia e impactos ambientais : o efeito estufa e a elevação da temperatura no globo

Abstract

There are nearly nine thousand years ago began to air pollution , with displacements of the first hominids . Another ancient source of air pollution is based on fires deliberately made in natural forests and fields in order to prepare the land for cultivation. Only during the 1980s is that the concern about possible climate change became larger after being revealed scientific evidence about during the World Conference on Atmospheric Change held in Toronto in Canada . Already in the early '90s , emerge strong appeal for the establishment of a global pact . Currently around 200 000 burned displaying satellite in Brazil per year and 25 million cubic meters of trees were felled in the Amazon in 2004 alone , with 60 % of this wood were decomposing in the woods . About 75 % of CO2 emissions come from the burning of Brazil in the Amazon region , which puts the country among the five biggest polluters in the world. With all this in mind, the Protocol of Quito (Ecuador ) arises predicting that between the years 2008 and 2012 , rich countries should reduce on average 5 % of CO2 emission of carbon dioxide , based on the parameters 1990 . The Framework UN Convention on Climate Change , signed in Rio de Janeiro in 1992 , 175 countries plus the European Union, ratified the concern about global warming - Brazil has banned 82 % of the CFCs.