Max Gerber] I am often asked whether I agree with the new group selectionists, and the questioners are always surprised when I say I do not. After all, group selection sounds like a reasonable extension of evolutionary theory and a plausible explanation of the social nature of humans.
Half of the world's wetlands were lost last century. Logging and conversion have shrunk the world's forests by as much as half. Some 9 percent of the world's tree species are at risk of extinction; tropical deforestation may exceedsquare kilometers per year.
Fishing fleets are 40 percent larger than the ocean can sustain. Nearly 70 percent of the world's major marine fish stocks are overfished or are being fished at their biological limit. Soil degradation has affected two-thirds of the world's agricultural lands in the last 50 years.
Some 30 percent of the world's original forests have been converted to agriculture. Sincethe global economy has tripled in size and population has grown by 30 percent to 6 billion people. Dams, diversions or canals fragment almost 60 percent of the world's largest rivers.
Twenty percent of the world's freshwater fish are extinct, threatened or endangered. People and Ecosystems, the Fraying Web of Life United Nations Development Programme A pioneering analysis of the world's ecosystems reveals a widespread decline in the condition of the world's ecosystems due to increasing resource demands.
The analsysis, by the World Resources Institute WRI warns that if the decline continues it could have devastating implications for human development and the welfare of all species. The analysis examined coastal, forest, grassland, and freshwater and agricultural ecosystems. The health of the each ecosystem was measured, as based on its ability to produce the goods and services that the world currently relies on.
The analysis shows that there are considerable signs that the capacity of Earth's ecosystems to produce many of the goods and services we depend on is rapidly declining. To make matters worse, as our ecosystems decline, we are also racing against time since scientists lack baseline knowledge needed to properly determine the conditions of such systems.
New Analysis of World's Ecosystems Reveals Widespread Decline ENN Will our great- grandchildren inherit a desiccated husk of a once shimmering planet, and curse us for a legacy of droughts, plagues,storms and hardscrabble moonscapes? The four-fold increase in humans and the advent of the consumer society - have made the end of the millennium a cusp of history.
Affluent consumers in Hong Kong want exotic fish and presto! Poachers in the Philippines destroy vital reefs to meet that demand. Millions of workers in China and Russia are plagued with pollution-related ailments.
We need your help to ask President Barack Obama and the Environmental Protection Agency to get working on a bold plan to curb ocean acidification. Carbon dioxide pollution is also being absorbed by the ocean, causing its chemistry to change and become more acidic.
This spells trouble for marine animals that are now having difficulty building shells, growing and sometimes even surviving in increasingly corrosive waters. Damian Carrington Seafood is the critical source of protein for more than 2. Official catch data from FAO rarely includes small-scale, sport or illegal fishing and does not count fish discarded at sea.
A more exhaustive study, taking over a decade shows that the annual catches between and were much bigger than thought, but that the decline after the peak year of was much faster than official figures.
The new research estimates the peak catch was million tons, but declined at 1. Prof Daniel Pauly, at the University of British Columbia in Canada and who led the work, said the decline is very strong and "is due to countries having fished too much and having exhausted one fishery after another.
While the results necessarily remain uncertain, they undoubtedly represent our most complete picture yet of the global state of fish catches.
But afterfew undiscovered fisheries were left and catches started to decline.Etymology. The word origin of vertebrate derives from the Latin word vertebratus (), meaning joint of the spine. The Proto-Indo-European language origins are still unclear..
Vertebrate is derived from the word vertebra, which refers to any of the bones or segments of the spinal column.. Anatomy and morphology. Yahoo Lifestyle is your source for style, beauty, and wellness, including health, inspiring stories, and the latest fashion trends.
JSTOR is a digital library of academic journals, books, and primary sources. The one process ongoing that will take millions of years to correct is the loss of genetic and species diversity by the destruction of natural habitats.
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The best way to describe this pathway to the lay public is to explain this is how evolution allows for ideal form to meet function in a tough environment. An unofficial collection of CRS reports on national security. Congressional Research Service Reports on Miscellaneous Topics. Land and Water Conservation Fund: Overview, Funding History, and Issues, August 17, ; Federal Management of Saltwater Recreational Fisheries, CRS In Focus, August 17, ; Medicare Coverage of End-Stage Renal Disease (ESRD), August 16, article highlights. Can we stop the devastation of our planet and save our own species? We are in a biodiversity crisis — the fastest mass extinction in Earth’s history, largely due to.
Find books in subject areas that are of interest to you. Salmon Country is a good overview of the natural phenomena of the pacific salmon, how it is related to our culture in the Pacific Northwest and the consequence of our lax terrestrial and aquatic ecosystem management that has lead to declines in salmon populations and extinction of some salmon initiativeblog.coms: 1.