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OVERFISHING Presented by: Siiri Paurson Tartu 2015 INTRODUCTION What is overfishing? What is causing overfishing? Why is overfishing a problem? Fishing down the food web (toitumisahela võrgustik) What can we do to help? WHAT IS OVERFISHING? Catching too much fish for the system to support leads to an overall degradation to the system. Overfishing is a non-sustainable use of the oceans. WHAT IS CAUSING OVERFISHING? Worldwide, fishing fleets are at least two to three times as large as needed to take present day catches of fish and other marine species. On a global scale we have enough fishing capacity to cover at least four Earth like planets. Overfishing have a large impact on the basic functioning of our marine ecosystems.
Fishery resources Capture fisheries resources are highly diverse. FAO landing statistics refer to about 2 500 species or group of species most of which are finfish. By far the most numerous fish species, and those most important to aquaculture and fisheries, are teleosts, or bony fish, which in the sea extend from small "grazing" species such as anchovy to large active predatory fish such as tuna. A similarly wide range is also found in freshwater, with the most important species from a production point of view belonging to the carp family. These account for over half the total of inland waters fisheries production. Marine capture fisheries resources are usually considered close to full exploitation worldwide with about half of them fully exploited, one quarter over exploited, depleted or
As the world’s population continues to grow, so does the amount of garbage that people produce. On-the-go lifestyles require easily disposable products, such as soda cans or bottles of water, but the accumulation of these products has led to increasing amounts of plastic pollution around the world. As plastic is composed of major toxic pollutants, it has the potential to cause great harm to the environment in the form of air, water and land pollution. If overfishing continues, if pollution continues, many of the species of today will disappear off. Put simply, plastic pollution is when plastic has gathered in an area and has begun to negatively impact the natural environment and create problems for plants, wildlife and even human population. Often this includes killing plant life and posing dangers to local animals. Plastic is an incredibly useful material,
normal. • The 2012 update of the IUCN Red List of Threatened Species shows that of the 63,837 species examined worldwide, 19,817 are threatened with extinction - nearly a third of the total. • If present trends continue, scientists warn that within a few decades, at least half of all plant and animal species on Earth will be extinct, as a result of climate change, habitat loss, pollution, acidifying oceans, invasive species, over- exploitation of natural resources, overfishing, poaching and human overpopulation. Lower Life Expectancy in the Fastest Growing Countries • According to a Harvard study, "Over the next forty years, nearly all (97%) of the 2.3 billion projected increase will be in the less developed regions, with nearly half (49%) in Africa." Already strained with relentless population explosion, many developing countries, such as in Sub Saharan Africa and Southern Asia, will experience a degradation of their quality and
biological control. This technique demands utmost caution and thorough study, as it could go all wrong, if not managed properly. It is very difficult to pick a side in the debate regarding intensive farming. While it is true that agricultural intensification is necessary to meet the ever-increasing population growth, it is also true that intensive use of chemical fertilizers will largely affect the health of human beings, plants, fish, honey bees, frogs, birds, and livestock. There is a tug-of-war between the animal rights activists and farmers of intensive farming. However, the debate is still ongoing, but we hope to see some new inventions or improvements in the near future. Read more at Buzzle: http://www.buzzle.com/articles/advantages-and-disadvantages-for-intensive- farming.html
These have no valid role at institutions of higher learning. The whole issue of scholastic competition needs careful review. Presently, space is so limited at many universities, and demand so high, that only students with the highest grades are accepted. Let us expand our ability to enroll students, and aim to admit all qualified applicants. This exclusion of non-A students bothers me more than high tuition rates do. Students in college can work summer jobs, such as fishing off Alaska, to earn their tuition; it is not necessary for parents or taxpayers to pay their way. Scholarships, based on deserving factors, are okay if endowed by private giving. I like to hope that even students of poor grades yet much promise might thereby get a chance to excel, as would very poor or otherwise handicapped ones. With the grades I received in high school, I did manage to get accepted by the University of Washington in 1980. But today there is no
leads to death and even the death of their young. Turtles, dolphins, and whales can choke or starve by confusing plastic bags for jellyfish. On land, plastic bags kill native birds, fauna, and other animals. Large pieces of plastic, such as bottles and packaging have well-known effects on sea life, strangling birds and fish and transporting alien species to new waters. Especially lethal is discarded fishing gear. Millions of tons of cut line, lines with hooks, and nets litter our oceans causing cause slow, painful deaths to everything from tiny seabirds to whales. The horrible truth is that every piece of plastic ever made still exists. There are thousands and thousands pieces of plastic floating in the world’s oceans. Agreeing: Disagreeing: · In my opinion... · I don't think so. · The way I see it..
SISUKORD ENERGY STORY................................................................................................................4 USES OF ENERGY............................................................................................................. 4 2.1 Uses of energy in homes...............................................................................................5 2.2 Types of energy used in homes.................................................................................... 6 2.3 Energy use in different types of homes........................................................................ 6 2.4 Commercial Energy Use...............................................................................................9 2.5 Industrial and Manufacturing Energy Use..................................................................11 2.6 Transportation Energy Use.........................................................................................12 RENE
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