Global warming is the increase in the average measured temperature of the Earth's near-surface air and oceans since the mid-20th century, and its projected continuation.
Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 100 years ending in 2005.[1][2] The Intergovernmental Panel on Climate Change (IPCC) concludes "most of the observed increase in globally averaged temperatures since the mid-twentieth century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations"[3][4] via an enhanced greenhouse effect. Natural phenomena such as solar variation combined with volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect from 1950 onward.[5][6] These basic conclusions have been endorsed by at least 30 scientific societies and academies of science,[7] including all of the national academies of science of the major industrialized countries.[8][9][10] While individual scientists have voiced disagreement with these findings,[11] the overwhelming majority of scientists working on climate change agree with the IPCC's main conclusions.[12][13]
Climate model projections summarized by the IPCC indicate that average global surface temperature will likely rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the twenty-first century.[3] This range of values results from the use of differing scenarios of future greenhouse gas emissions as well as models with differing climate sensitivity. Although most studies focus on the period up to 2100, warming and sea level rise are expected to continue for more than a thousand years even if greenhouse gas levels are stabilized. The delay in reaching equilibrium is a result of the large heat capacity of the oceans.[3]
Increasing global temperature is expected to cause sea levels to rise, an increase in the intensity of extreme weather events, and significant changes to the amount and pattern of precipitation, likely leading to an expanse of tropical areas and increased pace of desertification. Other expected effects of global warming include changes in agricultural yields, modifications of trade routes, glacier retreat, mass species extinctions and increases in the ranges of disease vectors.
Remaining scientific uncertainties include the amount of warming expected in the future, and how warming and related changes will vary from region to region around the globe. Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions, but there is ongoing political and public debate worldwide regarding what, if any, action should be taken to reduce or reverse future warming or to adapt to its expected consequences.
lunes, 27 de octubre de 2008
more information about global warming
Global warming is the increase in the average measured temperature of the Earth's near-surface air and oceans since the mid-20th century, and its projected continuation.
Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 100 years ending in 2005.[1][2] The Intergovernmental Panel on Climate Change (IPCC) concludes "most of the observed increase in globally averaged temperatures since the mid-twentieth century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations"[3][4] via an enhanced greenhouse effect. Natural phenomena such as solar variation combined with volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect from 1950 onward.[5][6] These basic conclusions have been endorsed by at least 30 scientific societies and academies of science,[7] including all of the national academies of science of the major industrialized countries.[8][9][10] While individual scientists have voiced disagreement with these findings,[11] the overwhelming majority of scientists working on climate change agree with the IPCC's main conclusions.[12][13]
Climate model projections summarized by the IPCC indicate that average global surface temperature will likely rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the twenty-first century.[3] This range of values results from the use of differing scenarios of future greenhouse gas emissions as well as models with differing climate sensitivity. Although most studies focus on the period up to 2100, warming and sea level rise are expected to continue for more than a thousand years even if greenhouse gas levels are stabilized. The delay in reaching equilibrium is a result of the large heat capacity of the oceans.[3]
Increasing global temperature is expected to cause sea levels to rise, an increase in the intensity of extreme weather events, and significant changes to the amount and pattern of precipitation, likely leading to an expanse of tropical areas and increased pace of desertification. Other expected effects of global warming include changes in agricultural yields, modifications of trade routes, glacier retreat, mass species extinctions and increases in the ranges of disease vectors.
Remaining scientific uncertainties include the amount of warming expected in the future, and how warming and related changes will vary from region to region around the globe. Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions, but there is ongoing political and public debate worldwide regarding what, if any, action should be taken to reduce or reverse future warming or to adapt to its expected consequences.
Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the 100 years ending in 2005.[1][2] The Intergovernmental Panel on Climate Change (IPCC) concludes "most of the observed increase in globally averaged temperatures since the mid-twentieth century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations"[3][4] via an enhanced greenhouse effect. Natural phenomena such as solar variation combined with volcanoes probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect from 1950 onward.[5][6] These basic conclusions have been endorsed by at least 30 scientific societies and academies of science,[7] including all of the national academies of science of the major industrialized countries.[8][9][10] While individual scientists have voiced disagreement with these findings,[11] the overwhelming majority of scientists working on climate change agree with the IPCC's main conclusions.[12][13]
Climate model projections summarized by the IPCC indicate that average global surface temperature will likely rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the twenty-first century.[3] This range of values results from the use of differing scenarios of future greenhouse gas emissions as well as models with differing climate sensitivity. Although most studies focus on the period up to 2100, warming and sea level rise are expected to continue for more than a thousand years even if greenhouse gas levels are stabilized. The delay in reaching equilibrium is a result of the large heat capacity of the oceans.[3]
Increasing global temperature is expected to cause sea levels to rise, an increase in the intensity of extreme weather events, and significant changes to the amount and pattern of precipitation, likely leading to an expanse of tropical areas and increased pace of desertification. Other expected effects of global warming include changes in agricultural yields, modifications of trade routes, glacier retreat, mass species extinctions and increases in the ranges of disease vectors.
Remaining scientific uncertainties include the amount of warming expected in the future, and how warming and related changes will vary from region to region around the globe. Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions, but there is ongoing political and public debate worldwide regarding what, if any, action should be taken to reduce or reverse future warming or to adapt to its expected consequences.
jueves, 23 de octubre de 2008
global warming energy
over 40% of the uk carbon dioxide emmissions,the main green house gas wich causes climate
change actually come from the things we do every day.
Things like living lights on unnecesarily or overfilling the kettle all waste energy and result in
needles carbion dioxid emmisors.
change actually come from the things we do every day.
Things like living lights on unnecesarily or overfilling the kettle all waste energy and result in
needles carbion dioxid emmisors.
miércoles, 22 de octubre de 2008
que ocurriria si el agua se acabara?
Siendo un tema tan importante, busqué en Google y obtuve la información que proporciona el Sr. Alex Kirby
BBC, Especialista en Medio Ambiente:
"La crisis provocada por la falta agua en el mundo es fácil de entender pero difícil de resolver.
La cantidad de agua en nuestro planeta es finita.
La ONU señala que cada persona necesita un mínimo de 50 litros diarios para beber, bañarse, cocinar y otros menesteres.
Proveer acceso universal a ese mínimo de 50 litros para 2015, implicaría menos del 1% de la cantidad de agua que se usa hoy en el mundo. Sin embargo, parece un objetivo lejano de alcanzar.
La calidad es tan importante como la cantidad: el aumento de la contaminación en ciertas áreas, hace que disminuya la cantidad de agua utilizable.
Y los efectos colaterales de la falta de agua son preocupantes como la perspectiva de que no haya suficiente agua para beber.
El cambio climático también tendrá su impacto. Algunas áreas probablemente se beneficiarán con el aumento de las lluvias, pero otras zonas se verán negativamente afectadas.
Es importante repensar cuánta agua realmente necesitamos si queremos aprender a compartir los recursos de nuestro planeta.
Para millones de personas en todo el mundo, encontrar el balance es una cuestión de vida o muerte."
Creo que ésta ha sido una "Gran pregunta" porque a veces creemos que el agua es un recurso inagotable.
Antes de que se cumplan los vaticinios científicos del Sr. Kirby debemos EDUCAR a nuestros niños y jóvenes para que puedan hacer la diferencia.
Los mayores muchas veces están adormecidos y piensan que son "protestas de los ambientalistas que con sus marchas y advertencias" desean llamar la atención.
Si los niños se sensibilizan a esta dramática realidad tengan por seguro que habrá un cambio.
El planeta Tierra es nuestro hogar junto a muchas otras especies. No olvidemos que las plantas y los animales llegaron antes que nosotros y merecen la oportunidad de convivir en paz. Nos prestaron su hábitat...
¡¡¿Qué estamos haciendo con él?!!
hace 2 años
Fuente(s):
Sr. Alex Kirby
BBC, Especialista en Medio Ambiente:
Información obtenida en Google.
el apocalipsis se acerca bien rapido
Gracias a la contaminacion el apocalipsis se acerca mas rapido los cientificos
tienen una teoria que puede ser cierta el agua va a aumentar en 2012 y hundiria paises y lugares como bejin vamos a tener que pagar el aire que respiremos
y moriremos todos absolutamente todos nadie sobrevivira tal vez nosotros no
pero nuestros hijos a que pasa con ellos no nsean egoistas.
ballenas asesinas en extincion
Los científicos del Instituto Polar Noruego afirman que ningún otro mamífero en el Ártico ingiere una concentración tan alta de sustancias químicas peligrosas producidas por el hombre.
La investigación descubrió que las orcas, o ballenas asesinas, han superado a los osos polares en el primer lugar de la tabla especies contaminadas.
"El Ártico se ha convertido en un vertedero de sustancias químicas", dijo a BBC Mundo Pilar Marcos, de la organización ecologista Fondo Mundial para la Naturaleza (WWF).
"Este estudio refleja el enorme desconocimiento que tenemos de nuestros mares", afirma.
Vertedero tóxico
El Instituto Polar Noruego analizó muestras de grasa de ballena tomadas de especimenes en Tysfjord, en el Ártico noruego.
Las sustancias químicas que encontraron en los cetáceos incluían pesticidas, sustancias para retardar el fuego y los bifeniles policlorinados, o PCB, que solían utilizarse principalmente en procesos industriales.
Los investigadores están particularmente preocupados por las sustancias para retardar el fuego, porque a diferencia de muchos otros productos químicos peligrosos, su uso es legal.
Tal como señala Pilar Marcos de WWF, las principales especies afectadas por la contaminación tóxica son las que se encuentran en el primer lugar de la cadena trófica (alimenticia).
"Las ballenas, igual que los osos polares, reflejan la salud del medio ambiente marino", señala.
En el pasado, se ha estudiado mucho a las poblaciones de osos polares en Ártico, porque son más fáciles de investigar.
Pero hasta ahora no se había podido analizar la salud de estos animales.
"Los resultados de este estudio reflejan la urgente necesidad de que se establezcan una legislación más estricta para regular el uso de estas sustancias", afirma Pilar Marcos.
(fuente BBC mundo)
pandas en extincion
Este panda gigante llamado Bass come torta con un tenedor durante su fiesta de cumpleaños número 25 en el Zoológico de Fujian en China. El gigante chino tiene como prioridad absoluta la conservación de esta maravillosa especie, una iniciativa digna de imitar. Un saludo para China.
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