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Tuesday, November 11, 2008

Climate change plus human pressure caused large mammal extinctions in late Pleistocene

According to various estimates by scientists, every day 35- 150 species of life become extinct. Most of these vanishing species are inhabitants of tropical rain forests. A majority of them are insects or plants, and most remain undiscovered by humans at the time of their extinction.

There are a variety of causes that can contribute directly or indirectly to the extinction of a species or group of species. Currently, studies have shown that global warming may drive one quarter of all land animals and plants to extinction by 2050. Global warming has allowed some species to expand their range, bringing unwelcome competition to other species that previously occupied that area.
The major causes of animal extinction are:
i) taking animals for profit
ii) hunting and trapping
iii) overharvesting
iv) introduced species
v) destruction of habitats
vi) pollution

To prevent extinction, we can:
i) conserve habitats
ii) make space for our wildlife
iii) recycle, reduce and reuse
iv) plant native plants that are local to the area
v) control introduced plants and animals
vi) make your voice heard.

State and territory government conservation agencies are responsible for the management of national parks and the protection of wildlife. They are sometimes supported by public foundations.

Loss of biodiversity threatens livelihoods of world's poorest


Many countries nowadays are moving towards sustainable future. The idea about sustainable future is likely to capture the attention of people in the sense of responsible to maintain the system of this world as they are. We have been exploiting the natural sources for our own benefits. The times has come for us to think twice before taking anything from the nature as we already burden with the consequences such as global warming and climate change.

We hear more about sustainable forestry practices by the large logging multinationals. However, what does that really mean? Who is it sustainable for? Society and the environment, or for the logging companies? By replanting trees that will grow quickly and allow them to be felled for “sustained” logging sounds like a good strategy. However, the trees that are favored for this require a lot of water to grow so quickly. The trees achieve this rapid growth by tapping large quantities of groundwater, impoverishing surrounding vegetation and threatening to dry up local water courses.

Many of the actions that have been taken to conserve biodiversity and promote its sustainable use have been successful in limiting biodiversity loss. Rates of loss are now lower than they would have been in the absence of such actions. Less biodiversity would exist today had not communities, NGOs, governments, and, to a growing extent, business and industry taken actions to conserve biodiversity, mitigate its loss, and support its sustainable use. To achieve greater progress toward biodiversity conservation, it will be necessary but not sufficient to strengthen a series of actions that focus primarily on conservation and sustainable use of biodiversity and ecosystem services.