Define global warming?

Answer 1

Global warming is the relatively minor warming that has occured over the last century. It has warmed by approximately 0.7*C in that time. This warming followed several centuries of cooling known as the little ice age. The little ice age was caused by a reduction in the sun's output known as the maunder minimum. An increase the in the sun's output is causing the current warming.

Answer 2

Periods when the sun outputs more energy. The increased output of visible light heats the landmasses and oceans. During these periods of increased solar energy the sun emits much stronger solar wind, thereby shielding the earth from the myriad of extremely high energy subatomic particles called cosmic rays emanating from the entire universe. These subatomic particles collide with the earths atmosphere and aid in cloud generation. During periods of increased solar activity there are fewer clouds which allow even more visible light to heat the oceans and land masses, even more.

The period of increased solar output that caused the last few decades to be warmer, peaked about the turn of the century. There have been several of these episodes in human history which have lead to prosperous times for humanity.

The current warm era we live in is an important reason that the earth can maintain 6.5 billion humans. If the warming observed over the last few decades does not continue, it will not be possible to maintain the projected population of 9 billion humans by the middle of this century.

http://www.21stcenturysciencetech.com/Articles%202004/Winter2003-4/global_warming.pdf

Answer 3

In essence, global warming means exactly what it says. A gradual rise in the average global temperature. Now this effect can be achieved through a slew of different methods. The one most commonly discussed today is the effects greenhouse gases have on our environment.

Answer 4

The definition is amazingly ordinary – “an develop interior the typical temperature of Earth’s atmosphere”. A extra customary definition that throughout regards to the human component to international warming could be “an develop interior the typical temperature of Earth’s atmosphere as a effect of anthropogenic greenhouse gas emissions”.

Answer 5

Excessive greenhouse effect caused by man's activities.

More:

Some gases ("greenhouse gases") let sunlight in, which warms the Earth, and then block that heat from leaving. That's the "greenhouse effect", and it's a natural thing, mostly caused by water vapor.

Man is making excessive amounts of greenhouse gases, mostly by burning fossil fuels. That causes the delicate natural balance to go out of whack and the Earth warms. That's global warming.

It won't be a Hollywood style disaster. Gradually coastal areas will flood and agriculture will be damaged. But it will be very bad. Rich countries will cope, but it will take huge amounts of money. In poor countries many people will die of starvation, but not all of them.

Most scientists say, in 20-50 years. But we need to start right now to fix it, fixing it will take even longer than that.

More information here:

http://profend.com/global-warming/

Lots of numerical scientific data proving it real here:

http://en.wikipedia.org/wiki/Image:Climate_Change_Attribution.png
http://www.ipcc.ch/SPM2feb07.pdf

Answer 6

well, most of global warming is actualy cause by nature, we contribute about 5% to it every year the worst thing that ruins our globe is volcanic eruptions as sulfer destroys the air and puts sulfur in the sea trees live on carbon dioxcide but nothing lives or breaths sulfur, there are volcanoes the erupt all the time which heat up the ocean and the air and cause alot of different air pockets of different temps which cause our weather patterns the reason our goverments around the world are telling us to change the way we live is for them to try and bring out new cars and gadgets for them to make more money out of us and oil and gas help to keep the plates on which we live afloat and stop them from coliding in each other the more we take from the earth the more earth quakes and and natral disasters will accure the reason for oil in the earth is to keep the plates from rubbing and it keeps the sea temp from rising to much or dropping to low the gas helps keep uor plates afloat without either of these chemicals we are in deep trouble, but when the oil is all used up our magnetic pull will change to as its already changed the moons pull and the suns explosions are beginning to disrupt already why do u think we have a space station?
its not only 4 space shuttles its for trip 2 other plantets that we are not told exsist, they have most likely already started tp populate there as our planet is a ticking time bomb, there experimenting with new ideas here so they can set up the new planet properly without destroying, i know it sounds far fetched but think about, if they new in the 70's that wat they were doing to the earth was going to damage it don't you think they would've stopped?
no because they need the money to spend somewhere else all of us are just ants to our goverments to give our money to them so they can set up somewhere else there is a big boss that controls all and only a very small amount of people know wats really going on our priminister and other presidents are pupets on strings they do some of there own work but, they always have some one higher telling them wat to say and wat to do

Answer 7

VERY basically, global warming is the artificial warming of the Earth's atmosphere due to pollution caused by human activities & byproducts.

Answer 8

Albert (6) Arnold (6) Gore Jr's (6) attempt to unite the world under the false hope of peace and unity with the Kyoto Treaty, only to falsely lead us to the dark angel.

Answer 9

This link should tell you every thing.

Answer 10

GLOBAL WARMING.

INTRODUCTION-
Global warming refers to the increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation.

The global average air temperature near the Earth's surface rose 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the last 100 years. The Intergovernmental Panel on Climate Change (IPCC) concludes, "most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations" via the greenhouse effect. Natural phenomena such as solar variation combined with volcanoes have probably had a small warming effect from pre-industrial times to 1950, but a small cooling effect since 1950. These basic conclusions have been endorsed by at least 30 scientific societies and academies of science, including all of the national academies of science of the major industrialized countries. The American Association of Petroleum Geologists is the only scientific society that officially rejects these conclusions.A few individual scientists disagree with some of the main conclusions of the IPCC.

Climate models referenced by the IPCC project that global surface temperatures are likely to increase by 1.1 to 6.4 °C (2.0 to 11.5 °F) between 1990 and 2100. The 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 millennium even if greenhouse gas levels are stabilized. This reflects the large heat capacity of the oceans.

An increase in global temperatures is expected to cause other changes, including sea level rise, increased intensity of extreme weather events, and changes in the amount and pattern of precipitation. Other effects include changes in agricultural yields, glacier retreat, species extinctions and increases in the ranges of disease vectors.

Remaining scientific uncertainties include the exact degree of climate change expected in the future, and how changes will vary from region to region around the globe. There is ongoing political and public debate on a world scale regarding what, if any, action should be taken to reduce or reverse future warming or to adapt to its expected consequences. Most national governments have signed and ratified the Kyoto Protocol, aimed at reducing greenhouse gas emissions.


CAUSES-
Earth's climate changes in response to external forcing, including variations in its orbit around the sun (orbital forcing), volcanic eruptions, and atmospheric greenhouse gas concentrations. The detailed causes of the recent warming remain an active field of research, but the scientific consensus identifies elevated levels of greenhouse gases due to human activity as the main influence. This attribution is clearest for the most recent 50 years, for which the most detailed data are available. In contrast to the scientific consensus that recent warming is mainly attributable to elevated levels of greenhouse gases, other hypotheses have been suggested to explain the observed increase in mean global temperature. One such hypothesis proposes that warming may be the result of increased solar radiation associated with greater numbers of sunspots.

None of the effects of forcing are instantaneous. The thermal inertia of the Earth's oceans and slow responses of other indirect effects mean that the Earth's current climate is not in equilibrium with the forcing imposed. Climate commitment studies indicate that even if greenhouse gases were stabilized at 2000 levels, a further warming of about 0.5 °C (0.9 °F) would still occur.


TEMPERATURE CHANGES-

RECENT CHANGES-

Global temperatures on both land and sea have increased by 0.75 °C (1.35 °F) relative to the period 1860–1900, according to the instrumental temperature record. This measured temperature increase is not significantly affected by the urban heat island. Since 1979, land temperatures have increased about twice as fast as ocean temperatures (0.25 °C per decade against 0.13 °C per decade). Temperatures in the lower troposphere have increased between 0.12 and 0.22 °C (0.22 and 0.4 °F) per decade since 1979, according to satellite temperature measurements. Temperature is believed to have been relatively stable over the one or two thousand years before 1850, with possibly regional fluctuations such as the Medieval Warm Period or the Little Ice Age.

Sea temperatures increase more slowly than those on land both because of the larger effective heat capacity of the oceans and because the ocean can lose heat by evaporation more readily than the land. Since the northern hemisphere has more land mass than the southern it warms faster; also there are extensive areas of seasonal snow cover subject to the snow-albedo feedback. Although more greenhouse gases are emitted in the northern than southern hemisphere this does not contribute to the asymmetry of warming as the major gases are essentially well-mixed between hemispheres.

Based on estimates by NASA's Goddard Institute for Space Studies, 2005 was the warmest year since reliable, widespread instrumental measurements became available in the late 1800s, exceeding the previous record set in 1998 by a few hundredths of a degree. Estimates prepared by the World Meteorological Organization and the Climatic Research Unit concluded that 2005 was the second warmest year, behind 1998.

Anthropogenic emissions of other pollutants—notably sulfate aerosols—can exert a cooling effect by increasing the reflection of incoming sunlight. This partially accounts for the cooling seen in the temperature record in the middle of the twentieth century, though the cooling may also be due in part to natural variability.

Paleoclimatologist William Ruddiman has argued that human influence on the global climate began around 8,000 years ago with the start of forest clearing to provide land for agriculture and 5,000 years ago with the start of Asian rice irrigation. Ruddiman's interpretation of the historical record, with respect to the methane data, has been disputed

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