how global warming impact polar bear's population?
87590
the size of the ice floes that polar bears use to raise and feed their young is shrinking...some parts of the arctic are seeing open water for longer stretches of time, and as a result the polar bears find it more difficult to find an environment suited to their needs.  \n\nyou'd assume this will result in them eventually decreasing in number or migrating elsewhere...unfortunately the first option is what will probably be happening.
698388
The artic ice shelf IS melting .Not a myth .Polar bears ARE drowning .Artic communities have experienced increased flooding and evacs.Worst droughts out west since the thirties.There is abundant evidence of glaciers retreating.The science is out there and I will believe scientific evidence and experience  over people who want to bury their heads in the sand and stupidly do nothing any day of the week.Don't let yourself get conned by people who are in denial and have no proof of their own to contradict scientific evidence and eyewitness accounts .Global warming is no joke and we must do something to prevent it from getting worse now before it's too late.
1037989
Isn't global warming enough?! Because of this ice bergs are melting which mean animals will die. Air is becoming thinner which means we can die.  Global warming IS something to worry about!\n\nwww.stopglobalwarming.org
428545
I know polar bears only live in the north pole. There isn't any life in the south pole.
880541
The polar bear is very well capable of killing an alligator given the proper environment so the polar bear would win.While alligators may kill larger prey by grabbing it and dragging it in the water to drown polar bears are too aggressive and strong to let alligators do this to them. \n\nAnyway if you want to have some fun about animal fights, check out this link:\nhttp://underscorebleach.net/jotsheet/2006/06/animal-fights?viarss
260369
No but it would affect existence on the planet! There is a delicate balance to be maintained and if polar ice caps melted, this balance would be tipped over.  You can certainly expect weird weather.
1082968
I read in new scientist that there there is a certain current in the Atlantic that transports hotter ocean water from the south to the north.\n\nWhat happens here is the arctic ice will cool the temperature of the water down and it will thus flow south again.\n\nWith global warming there will be a constant flow of hot water to the north thus raising the water level there. So all places on the northern hemisphere would get affected first. \n\nI'm not too sure I got all the facts right but it has something to do with a current though.
435225
--Humans cut down forests and woodlands and plough the soil for agricultural purposes to produce more food. This decreases photosynthesis and there is less utilization of CO2 and so the atmospheric CO2 increases in concentration, hence disturbing the carbon cycle and leading to global warming.\n--Due to the increasing human population, more vehicles are now in use and the car exhaust release more of pollutant gases including CO2, and so the concentration of CO2 in air increases.\n--Excessive combustion of fossil fuels also release CO2 in the atmosphere and increase its concentration. This leads to global warming which has the following effects: (1) Melting of polar ice caps due to increased temperature, resulting in floods. (2) Evaporation of water from water bodies, altering the rainfall pattern and climatic conditions. (3) More evaporation of water from the soil, leading to drought and famine.\nHowever, and increase in temperature increases the rate of photosynthesis. Hence more of 02 is evolved and the cycle can be brought back to normal.
514782
Anthropogenic impact means human impact. Even without human interference, the earth goes through natural warming and cooling cycles. Most recently there was an ice age (with glaciers that melted to form the great lakes), and that's why the earth is warming now. "Global warming," though significantly sped up by humans, is a natural process that's been happening since life first began on this planet.
99016
Polar bears are endemic to the northern polar region for the same reason as elephants are indigenous to Africa and Asia. They just didn't migrate to the areas around what became Antarctica when they had the chance.
693093
Scientifically, 10-30 years due to Global Warming. Yes, Global Warming will kill the bacteria due to hot temperatures, knocking out the plankton, knocking out the kill, knocking out the whales and fish, knocking out the mammals, knocking out us (We are mammals). And if we don't get rid of the food chain first, the Polar Ice Caps will cause the sea to higher, making the atmosphere thinner. This will allow sun radiation in, killing the people by both radiation and thirst. You can e-mail me at montblancthemoogle@yahoo.com, for how you want to know how the bible and science will agree on this, because they both do in my explanation.
145826
It really sucks.  I just watched a report on 60 Minutes about this subject and we are in deep trouble.  They showed a picture of the arctic in 1979 and one just taken six months ago.  It is unbelievable how much ice has melted in just 26 years.  The most noted authority on this catastrophe said that even if we were to stop putting greenhouse gases into our atmosphere, it wouldn't change the fact that our global temperature will still rise.  It probably wouldn't rise quite as fast, but it will still happen because of all the gases we have already emitted.  We can only sove this problem collectively as a human race and not separately as nations.
1030004
The ice pack has been getting thicker but that has slowed down or stopped.  Antartica is not getting colder, and large pieces of ice are breaking away indicating that it is warming.  The snow pack depends on precipitation, not the temperature, and itself could be a sign of warming.\n\nSome regions of the earth will actually get colder due to global warming (at least for a while), as the cold water from melting ice is carried by ocean currents.
192654
We won't know for sure for a while, but we can speculate.\n\nGlobal warming primarily affects stom cycles, sea level and salinity, average temperature, etc. So think about how all those things could affect some animals.\n\nAlso note that not all animals will be affected, since some are more adaptive than others.
296292
global warming is real. its extremey or may not be related toinitially global warming causes the polar caps to melong termea water to rise and become lower in saline concentrations.\nthe lower the salt content the less the currents of the ocean flow and the COLDER the winters get (warm water not moving away from the equator) \nin natural cycles the more extreeme cold kills off organisms initally resulting in HIGHER greenhouse gases, but longterm the "ice age" that follows will leave less life (and death) reducing the overall emissions. this also increases the amount of icebound water increasing the salinity in the oceans returning the currenty\n\nSo You decide on the cause but it is real and geologically recorded again and again.
181457
Polar bears are in the Arctic.  Penguins are Antarctic, in the lower hemisphere.
941873
Global Warming is the phenomenon of increase in Earths Temperature due to Greenhouse Effect leading to melting of Polar Ice Caps\nAdding carbon dioxide (CO2) or methane (CH4) to Earth's atmosphere, with no other changes, will make the planet's surface warmer; greenhouse gases create a natural greenhouse effect without which temperatures on Earth would be an estimated 30 °C (54 °F) lower, and the Earth uninhabitable.\n\nOZONE layer is the Protective Shielding in the Atmosphere which saves us from harmful solar UV rays.IT is Naturally occuring trace gas, chemical formula O3. In the stratosphere, it serves to absorb many harmful solar UV rays.\n\nEarthquakE------An earthquake is a phenomenon that results from and is powered by the sudden release of stored energy that radiates seismic waves. At the Earth's surface, earthquakes may manifest themselves by a shaking or displacement of the ground and sometimes tsunamis, which may lead to loss of life and destruction of property.