segunda-feira, 1 de dezembro de 2008
Greenhouse effect
Greenhouse effect is a natural occurrence and is what maintains the Earth’s temperature.
Many people believe that this greenhouse effect is a good thing and will provide a tropical world in which the Earth will thrive with growth, unfortunately it does not work this way with enhanced greenhouse effects.
Natural greenhouse effects are enhanced by greenhouse gasses emitted in mass quantities since the birth of the Industrial Revolution two centuries ago. These manmade gasses have altered and continue to alter Earths natural method of dealing with greenhouse gasses effectively and trap the heat from the sun inside.
This effect continues to escalade over time and eventually will alter the Earth’s core temperature enough to completely change the Earth as we know it, eliminating species.
Air pollution in Portugal
In Portugal, the quality problems of the air does not affect the territory in a systematic way, and is located in some areas as Sines, Setúbal, Barreiro-Seixal, Lisbon, Estarreja and Oporto (where the urban concentration is bigger).
Causes:
-The air pollution is the result of the production of gases.
-Industrial activity.
-Motorized vehicles.
-Fires.
-Burning of garbage.
Consequences:
-Affects the security.
-Erodes the buildings.
-Affects the welfare.
-Affects people's health.
With these things, we cannot say that Portugal's situation is the worst though, there are four thousand premature deaths and a loss of average life expectancy of a few months.
We need to act now!
resources: http://marta.no.comunidades.net/
Dark view on animal species in Portugal
A recent update of the red book of the vertabrates reveals that almost half of the animal species in our country are endangered. There are others which are already extinct such as the sturgeon, brown bear and falcon. The mountain goat is one of the few species that reappears in its habitat...From 512 species of vertabrates that exist in Portugal, 42% are in danger, and these 42% species have special categories as 'critically endangered' , 'endangered and vulnerable', 'near threatened'.
In our country, the species which are more vulnerable to become extincts are, the freshwater fishes and migratory fishes.
in Portugal 69% of fishes, 38% of birds, 19% of anphibians and 26% of mammals are in danger.
Resources: http://ciberia.aeiou.pt/gen.pl?p=stories&op=view&fokey=id.stories/4626
Deforestation
More than 80 percent of the Earth’s natural forests already have been destroyed.
Among the obvious consequences of deforestation is the loss of living space. Seventy percent of the Earth’s land animals and plants reside in forests.
Deforestation may have catastrophic global effects as well. Trees are natural consumers of carbon dioxide—one of the greenhouse gases whose buildup in the atmosphere contributes to global warming. Destruction of trees not only removes these “carbon sinks,” but tree burning and decomposition pump into the atmosphere even more carbon dioxide, along with methane, another major greenhouse gas.
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