It wasn’t long ago since the Caribbean monk seal was officially listed as extinct by the US Government. And now the IUCN, the International Union for Conservation of Nature, reports that the Northern white rhino (Ceratotherium simum cottoni) is “on the brink of extinction“.

According to older reports the only remaining population of Northern white rhino is restricted in the wild to Garamba National Park in the Democratic Republic of Congo. The population was 30 in April 2003 but was reduced due to poaching to only four confirmed animals by August 2006. Now in 2008 the IUCN haven’t been able to find any Northern white rhinos at all.

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There are many ecosystems on earth not rich in vegetation and other organisms. This is natural wherever there is low rainfall and hostile ground. However, there are other areas, in theory able to sustain a variety of living organisms, with enough rainfall and mild climate, but which have as little variety as the first category. Their soil remains poor and unsuitable for vegetation. Such ecosystems have been eroded by human activities, often to the point of desertification.

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It has been almost one year since the last big fires were set in Europe. Last summer, many square kilometres of forests were burnt into ashes, with Greece being the most serious example. One year later, authorities have taken no measures to face similar problems.

Fires are rather often in Mediterranean ecosystems, due to the mild winter and the long dry summers. High temperatures and drought, in combination with dead leaves on the ground, often cause fires. But when referring to a natural process, often means every eight to ten years.

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Iceland has killed two polar bears since the U.S. Department of Interior formally listed the polar bear as a “threatened” species a few weeks ago.

The first polar bear, named Björn Björnesson, came to Iceland in the beginning of June this year. The polar bear was shot as soon as he was spotted for fears he would get into the nearest village. According to the hunters, killing the polar bear was the only solution as it would take to long to get the anaesthetic that was on the other side of the island.

The polar bear had probably travelled the 29 miles (47 kilometres) from Greenland on a flake of ice and swim the last miles to Iceland.

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There are many environmental problems caused by human but not widely known. One of them is eutrophication. This phenomenon cannot be entirely characterised as water pollution, as it mostly describes the process of too many plants growing in lakes, rivers and sometimes in the sea.

When household and industrial wastes are disposed into the water, they increase the quantity of germs in it. Germs threaten the health of the organisms living in the water, drinking it or feeding on organisms that live in it. Moreover, huge quantities of nitric and phosphoric salts enter the ecosystem. Phytoplankton, the tiniest sea organisms that can photosynthesize and depend highly on those salts, start to grow in population at top speed, consuming oxygen. As a result, zooplankton which feeds on phytoplankton starts to increase in numbers, again consuming oxygen and producing carbon dioxide.

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The Caribbean monk seal has gone “the way of the dodo” and been officially listed as extinct by the US Government. The Caribbean monk seal is, so far, the only seal species to go extinct due to human causes.

“Humans left the Caribbean monk seal population unsustainable after overhunting them, Unfortunately, this led to their demise and labels the species as the only seal to go extinct from human causes.”

The last time anyone sighted the Caribbean monk seal was in 1952, over 50 years ago, at Seranilla Bank, between Jamaica and the Yucatan Peninsula. In 1967 the USA listed the species as endangered due to human activities.

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Tropical rainforests have the largest biodiversity of all ecosystems on Earth. The soil is rather poor, but it sustains a great variety of plants. It is estimated that 65% of the known plant species are found in rainforests.

During the past three decades, rainforests have been decreasing in size for various reasons, though all of them are connected with human activities. Human populations living near rainforests had the impression that the soil must have been really fertile, as it could sustain such a variety of plants. So, when human started to need more fields for cultivation, they choose rainforests’ earth, and thus they set big fires to get rid of big trees and to obtain space. By the time it was understood that the soil wasn’t suitable for agriculture, many square kilometres of rainforests had already gone.

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During a nighttime robbery, the horn of a 120-year-old stuffed rhinoceros was stolen, from the museum where it was displayed. Museum authorities warned that using this horn as a traditional medicine on the Asian black market could have lethal consequences because it was preserved by the use of the deadly arsenic and DDT.

But causing immidiate death should not be the only concern. The fact that DDT is still in use is really alarming, since it is a substance that causes accumulation. As an environmental term, accumulation is the gradual increase of pollutants in living organisms by direct adsorption or through food chains. The pollutants that cause accumulation cannot be metabolized or aborted by any means, so accumulation of the substance increases while going up a food chain.

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