2048 Graphic Novel (Spanish)

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  1. Extra viajes national geographic nro. 7 junio de autor National Geographic pdf gratis
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Description Conveniently sized and still easy to read, the LBLA Hand Size Giant Print Bible features the full text of the LBLA translation understandable to the general public and still suitable for serious study , full-color maps, a concordance and other key helps for a Bible reading experience that is always rewarding. Upcoming Events No upcoming events available.


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  5. Extra viajes national geographic nro. 7 junio 2018 de autor National Geographic pdf español gratis.
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Create new account Request new password. Shopping cart There are no products in your shopping cart. Nevertheless, there are countless developing countries whose priorities are very different, and respect for the environment is not currently one of them. Despite this, they can be given the necessary knowledge and means so as to meet environmental demands too, so that their development does not create more damage than we have already done. The rise of industries and their energy needs has led to unsustainable consumption of combustible fossil fuel resources.

The main effect of this consumption has been an exponential increase in carbon dioxide CO2 in the atmosphere. This gas, among others, is responsible for the greenhouse effect that is causing changes in climate whose consequences are still difficult to predict today. The sea is one of the main carbon sinks.


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  • Much of the CO2 in the atmosphere is trapped by plants on land, but an even larger amount is trapped by planktonic organisms that live in the sea. Just like the land plants, they carry out the task of photosynthesis, using the carbon to produce their skeletons or shells and in the process releasing oxygen.

    As if that were not enough, marine pollution, which affects the areas of most plankton production, also has an effect on these organisms, so that the capacity for photosynthesis and trapping atmospheric carbon is reduced. This speeds up all of the degradation processes and hence the foreseeable adverse effects of climate change. The transport in itself should not imply a direct impact, but the deficient practices and risks inherent in this means of transport give rise to cases of more or less serious pollution problems. From large-scale catastrophes caused by accidental spills from oil tankers and other dangerous goods transport toxic, radioactive, etc.

    Nevertheless, over the last 10 years a great effort has been made to regulate the transport techniques and handling of crude oil-based products, which has led to the concentrations of hydrocarbons at high sea decreasing considerably. To compensate loads or to sail with more ballast and stability, ships take water into their tanks in one port and discharge it in another when they no longer need it.

    This is an important means of transporting organisms that can thus colonise areas which in principle they could not reach naturally. In many cases, these species compete with the local ones, and can diminish local biodiversity and cause irreparable damage to the ecosystems. Many of these substances are characterised by their toxicity, their long persistence and their bioaccumulation in the food chain an increase in the concentration of a substance in an organism or a part of it, due to the fact that it accumulates it through food, respiration, etc until the concentration of the substance in the organism is higher than in the environment or in its food.

    The rest comes from direct dumping from ships and oil rigs, and from the sedimentation of particles in the atmosphere itself. In the sea, there are processes that effectively assimilate organic material and nutrients from land that give the ocean a noteworthy capacity for cleansing. The diverse biota that lives there is capable of metabolising a large part of these discharges, though obviously only the biodegradable ones, and only provided that they do not exceed limits. Lastly, one significant symptom is the increase in jellyfish in certain seas.

    It seems that the reason for this abundance is associated with the rising sea temperature and excessive ocean fertilisation largely of human origin , aggravated by the decrease in their natural predators such as turtles, tuna or swordfish. Fishing and aquaculture Bad environmental practices in certain fishing activities lead to deterioration in the quality of the marine environment.

    The dumping of a variety of waste such as used oils, plastics, and the remains of fishing equipment ropes, nets, buoys, etc. Fortunately, many fishermen have understood the problem and are now taking measures to avoid these bad practices, by collecting used oils and the remains left on board in order to deposit them in containers at the port. Aquaculture fish farming is a rising sector in the marine environment.

    Extra viajes national geographic nro. 7 junio de autor National Geographic pdf gratis

    Aquaculture is an activity that requires good environmental conditions to create safe, quality products, and ensure sustainable exploitation. The production problems it poses are mainly related to excretions, quality, and excessive feeding, as well as treatment with antibiotics and other chemical products. For the present production levels, there are environmental problems appearing due to unsuitable locations for the fish farms in some cases, and in others due to bad environmental practices by some fish farmers.

    Therefore, good regulations and the establishment of protocols that respect the environment will help the sustainability and competitiveness of this sector. While this activity brings in significant revenue in the coastal regions, it is also true that much of the infrastructure in these regions is not often designed by calculating to face the avalanche of tourists over the summer.

    One of the main kinds of infrastructure that generally suffers is water supply and treatment. A worse quality marine environment can often be found during periods of greater leisure use. If we add to this the increase in the use people make of beaches and leisure sailing, as well as their regrettably scant environmental awareness and that of the rest of the population still , then this gives rise to deterioration of the environment due to the greater presence of plastic and organic waste that ends up in the sea.

    The increase of ports for leisure marinas in the world, and with them watersports including leisure fishing , entails greater pressure on the environment.

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    It is essential to regulate the activity and create the necessary infrastructures to avoid more harm to the sea, above all if we take into account that this is a sector which is clearly booming, and that in a few years the number of leisure craft will multiply. Crude oil is toxic, but the refined products that come from it are more so, for example the gasoline or fuel-oil that are commonly used in motorised craft. These combustibles contain toxins that are soluble in water, and slow and difficult to biodegrade.

    They can directly kill all coastal and marine life near a spill. Generally, hydrocarbons can cause death by asphyxiation or poisoning, whether this be by absorption or contact. Moreover, they have negative effects on the marine flora and fauna, and are especially harmful to younger organisms, diminishing resistance to infections and various pathogens in all species.

    There are over different groups of PAHs, and all of them are considered to be persistent organic compounds, which means they can remain in the environment for long periods of time without diminishing their toxicity. Mammals can absorb PAHs by breathing, skin contact, or less frequently by consuming them.

    Plants can absorb them through their roots in polluted ground. PAHs of lower molecular weight are absorbed more quickly than those of greater molecular weight. PAHs damage genetic material, creating physical alterations or alterations in larval or embryonic phases, mutations and even tumours.

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    The most powerful carcinogens are those derived from benzene. According to the International Agency for Research into Cancer IARC , which answers to the World Health Organisation WHO and lists substances according to knowledge of their carcinogenic properties, residual fuel oil is classified as a possible human carcinogen. Nutrients The inorganic nutrients that have most influence on eutrophication processes are phosphates and nitrates. In some ecosystems the limiting factor is phosphate, as occurs in most freshwater lakes and reservoirs.

    However, in the sea the limiting factor is nitrogen. Over the past 20 or 30 years, nitrogen and phosphorous concentrations in many seas and lakes have practically doubled. Today, the main source of these nutrients is agriculture. In small quantities, nutrients from land help fertilise the coastal area, increasing plankton levels and the small species that feed off it. Other species feed off them in turn and hence this encourages the food chain to develop. Nevertheless, in large amounts they can encourage disproportionate growth or proliferation blooms in plankton populations, which upon dying and decomposing use up the oxygen necessary for life.

    The oxidation processes of organic matter consume oxygen. Thus, an excess of organic material leads directly to low oxygen concentrations, which taken to the extreme means depleting the oxygen. This process is known as eutrophication. As if this were not enough, in the last decade a significant rise in the frequency of toxic seaweed blooms WRI, has been detected.

    This is a serious problem for coastal populations and especially for species bred and exploited by humans, since their toxins may directly put an end to production, or worse still, be consumed by people, causing serious illnesses and even death in the most severe cases. Other dangerous substances heavy metals, PCBs, TBTs, and pesticides Heavy metals Heavy metal is the name given to chemical elements with an atomic weight of between Practically all metal elements of economic interest fall into this category, and therefore they are also of interest for mining. The heavy metals present in the marine environment originate from various sources.

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    The main ones are effluent pipes and industrial and urban discharges, although we cannot forget the ground-washing effect of water currents and rain runoff , nor the atmospheric contribution as particles produced from the burning of fossil fuels are deposited on the sea. Heavy metals are found in sea water as colloids a mixture of a liquid phase, usually water, and a disperse phase made up of particles that tend to come together and coagulate , mineral particles suspended solids , or dissolved phases cations or complex ions.

    No living being can develop and survive without the participation of metallic ions, since one of their functions is to induce enzyme activity.