Tag results for forests
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best earth footage 1080p hd enigma - gravity of love
Bookmarked 760 weeks ago i put this together from over 10 blu-ray discs showing off our most beautiful footage and put the best scenes into 4 minutes of footage enigma - gravity of love video made with hd footage of some of the most beautiful places on earth i dedicated this video to bring awareness to the growing issues that is facing wildlife and forests around the globe and to plea for you to do your part to make a difference in anyway you canif your looking for a reliable source for the info on the end of the video heres a link: http:wwwguardiancoukscience2004jan08biodiversitysciencenewsand here with even more worse statistics including factors such as deforestation hunting and overpopulation http:ecocentricblogstimecom20110303the-next-great-extinction-could-be-coming-sooner-than-you-thinkhuman activity since the industrial revolution has increased the amount of greenhouse gases in the atmosphere leading to increased radiative forcing from co2 methane tropospheric ozone cfcs and nitrous oxide the concentrations of co2 and methane have increased by 36 and 148 respectively since 175037 these levels are much higher than at any time during the last 650000 years the period for which reliable data has been extracted from ice cores383940 less direct geological evidence indicates that co2 values higher than this were last seen about 20 million years ago41 fossil fuel burning has produced about three-quarters of the increase in co2 from human activity over the past 20 years most of the rest is due to land-use change particularly deforestation42over the last three decades of the 20th century gdp per capita and population growth were the main drivers of increases in greenhouse gas emissions43 co2 emissions are continuing to rise due to the burning of fossil fuels and land-use change4445:71 emissions scenarios estimates of changes in future emission levels of greenhouse gases have been projected that depend upon uncertain economic sociological technological and natural developments46 in most scenarios emissions continue to rise over the century while in a few emissions are reduced4748 these emission scenarios combined with carbon cycle modelling have been used to produce estimates of how atmospheric concentrations of greenhouse gases will change in the future using the six ipcc sres quotmarkerquot scenarios models suggest that by the year 2100 the atmospheric concentration of co2 could range between 541 and 970 ppm49 this is an increase of 90-250 above the concentration in the year 1750 fossil fuel reserves are sufficient to reach these levels and continue emissions past 2100 if coal tar sands or methane clathrates are extensively exploited50the destruction of stratospheric ozone by chlorofluorocarbons is sometimes mentioned in relation to global warming although there are a few areas of linkage the relationship between the two is not strong reduction of stratospheric ozone has a cooling influence51 substantial ozone depletion did not occur until the late 1970s52 ozone in the troposphere the lowest part of the earth039s atmosphere does contribute to surface warmingoriginal references can be seen on this page: http:enwikipediaorgwikiglobal_warminggreenhouse_gases |
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barbie and ken: the breakup
Bookmarked 768 weeks ago on june 7th following ken039s breakup with the iconic superstar barbie ken and 8 buddies staged a protest at mattel headquarters in el segundo ca demanding that mattel stop using packaging from materials produced by rainforest destroyers |
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do trees communicate
Bookmarked 518 weeks ago in this real-life model of forest resilience and regeneration professor suzanne simard shows that all trees in a forest ecosystem are interconnected with the largest oldest quotmother treesquot serving as hubs the underground exchange of nutrients increases the survival of younger trees linked into the network of old trees amazingly we find that in a forest 11 equals more than 2suzanne w simard - faculty profile live link with tons more infolinksdr suzanne simard is a professor with the ubc faculty of forestry where she lectures on and researches the role of mycorrhizae and mycorrhizal networks in tree species migrations with climate change disturbance networks of mycorrhizal fungal mycelium have recently been discovered by professor suzanne simard and her graduate students to connect the roots of trees and facilitate the sharing of resources in douglas-fir forests of interior british columbia thereby bolstering their resilience against disturbance or stress and facilitating the establishment of new regenerationdr simard writes:mycorrhizal fungi form obligate symbioses with trees where the tree supplies the fungus with carbohydrate energy in return for water and nutrients the fungal mycelia gather from the soil mycorrhizal networks form when mycelia connect the roots of two or more plants of the same or different species graduate student kevin beiler has uncovered the extent and architecture of this network through the use of new molecular tools that can distinguish the dna of one fungal individual from another or of one tree039s roots from another he has found that all trees in dry interior douglas-fir pseudotsuga menziesii var glauca forests are interconnected with the largest oldest trees serving as hubs much like the hub of a spoked wheel where younger trees establish within the mycorrhizal network of the old trees through careful experimentation recent graduate francois teste determined that survival of these establishing trees was greatly enhanced when they were linked into the network of the old treesthrough the use of stable isotope tracers he and amanda schoonmaker a recent undergraduate student in forestry found that increased survival was associated with belowground transfer of carbon nitrogen and water from the old trees this research provides strong evidence that maintaining forest resilience is dependent on conserving mycorrhizal links and that removal of hub trees could unravel the network and compromise regenerative capacity of the forestsin wetter mixed-species interior douglas-fir forests graduate student brendan twieg also used molecular tools to discover that douglas-fir and paper birch betula papyrifera trees can be linked together by species-rich mycorrhizal networks we found that the mycorrhizal network serves as a belowground pathway for transfer of carbon from the nutrient-rich deciduous trees to nearby regenerating douglas-fir seedlings moreover we found that carbon transfer was enhanced when douglas-fir seedlings were shaded in mid-summer providing a subsidy that may be important in douglas-fir survival and growth thus helping maintain a mixed forest community during early succession this is not a one-way subsidy however graduate leanne philip discovered that douglas-fir supported their birch neighbours in the spring and fall by sending back some of this carbon when the birch was leafless this back-and-forth flux of resources according to need may be one process that maintains forest diversity and stabilitymycorrhizal networks may be critical in helping forest ecosystems deal with climate change maintaining the biological webs that stabilize forests may help conserve genetic resources for future tree migrations ensure that forest carbon stocks remain intact on the landscape and conserve species diversity ubc graduate student marcus bingham is finding that maintaining mycorrhizal webs may be more important for the regeneration and stability of the dry than wet interior douglas-fir forests where resources are more limited and climate change is expected to have greater impacts helping the landscape adapt to climate change will require more than keeping existing forests intact however many scientists are concerned that species will need to migrate at a profoundly more rapid rate than they have in the past and that humans can facilitate this migration by planting tree species adapted to warm climates in new areas ubc graduate student brendan twieg is starting new research to help us understand whether the presence of appropriate mycorrhizal symbionts in foreign soils may limit the success of tree migrations and if so to help us design practices that increase our success at facilitating changes in these forests |
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pink river dolphins
Bookmarked 721 weeks ago untamed americas : starts sun jun 10 at 9p etpt : http:channelnationalgeographiccomchannelthe pink river dolphins of the amazon are the only dolphins that can live in freshwater |
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tar sands oil extraction - the dirty truth
Bookmarked 724 weeks ago environmental devastation of the land water and air - the largest industrial energy project in the world is extracting crude oil from bitumen found beneath the pristine boreal forest of alberta canada effecting a land mass equivalent in size to florida or england both industry and government are putting money before the health and security of its people and the environmenttar sands take 3 barrels of water to process every barrel of oil extracted ninety percent of this water becomes so toxic that it must be stored in tailing ponds unfortunately these ponds regularly leach pollution into the third largest watershed in the worldwater depletion exploitation privatization and contamination has become one of the most important issues facing humanity this century check out my other video on water issues: http:wwwyoutubecomwatchv=xmmpg35bym0 and see my other videos to learn about the dark side of fossil fuelsto learn more about tar sands be sure to check out the featured film sources listed below find out more about what you can do and how to support the film makerscrude sacrificehttp:wwwcrudesacrificecomdirty oil available to watch onlinehttp:wwwyoutubecomwatchv=ja_bbgucs20 downstream -- available to watch onlinehttp:wwwbabelgumcom3015242downstreamhtmlh2oilhttp:h2oildoccomhomepetropolishttp:wwwpetropolis-filmcomcheck out a new promising technology to eliminate tailing ponds: http:wwwgizmagcomionic-liquids-used-to-process-tar-sands18214tar sands development can be minimized by blocking development of pipelines such as keystone xl that carry the sludge of this incredibly polluting energy project tell canada to clean up this mess and join with bill mckibben and josh fox and let your voice be heard |