Global Warming Facts

Global warming facts demonstrate unambiguously
that global warming is a very serious issue,
and it should be acted upon as a matter of urgency.

Global Warming Facts:
What is Global Warming

Fact

Global warming is an increase in the average temperature of the surface of the Earth (air and oceans) over the last 100 – 200 years.

global warming

Fact

During a 100-year period of 1906 – 2005, the global average temperature rose by 0.74°C.

Fact

11 of the 12 years between 1995 and 2006 have ranked among the 12 warmest years since 1850.

More Facts

The world is now hotter than at any time in the last 800 years. (1)

Further warming of more than 1°C will make the earth warmer than it has been in a million years. (2)

Fact

As a result of global warming, during the 20th century sea levels rose by 17 cm (6.7 inches); they rose faster in the 2nd half of this century than in the 1st.

global warming facts, greenland ice melting

Global Warming Facts:
Greenland Ice Cracking
Photo: Flickr.com

Fact

Snow cover in the Northern Hemisphere declined by 4% between 1920 and 2005.

More Facts

Ice sheets over Greenland lost almost 250 cubic kilometers of ice in the years between 2004 and 2007.

In March 2002 the vast Larsen B Antarctic ice-shelf dramatically collapsed releasing 5 billion tons of ice that shattered into tens of thousands of icebergs and drifted off into the ocean. (3)

Fact

The Earth is warmed naturally through the process called the greenhouse effect. During this process certain "greenhouse" gases in the atmosphere trap some energy (heat) emitted by the Earth into space, then re-radiate it back on to the ground and thus warm the planet.

Fact

The temperature at the outside of the Earth's atmosphere (i.e. without the greenhouse effect) is −18°C. The average temperature of the Earth, thanks to the greenhouse effect, is +15°C, which makes the planet inhabitable.

Fact

The main greenhouse gases are: water vapor, carbon dioxide, methane, nitrous oxide, ozone.

Fact

The natural concentrations of greenhouse gases in the atmosphere (which work to keep the planet warm) were pretty much constant during the Holocene – a period that started roughly 11,500 years ago – and before the industrial revolution. They increased dramatically since the advent of the Industrial Age at the start of the 19th century.

More Facts

Below are the pre-industrial and current concentrations of the main greenhouse gases in the atmosphere: (4)

bus pollution, transport pollution

Global Warming Facts:
Transport is a major man-made cause of greenhouse gas emissions
Photo: Doron Laor

 

                            Pre-industrial          Current

Carbon Dioxide (CO2)         280 ppm                 387 ppm

Methane (CH4)                   700 ppb                  1,745 ppb

Nitrous Oxide (N2O)           270 ppb                   314 ppb


*     ppm - parts per million
**   ppb - parts per billion

Fact

These higher concentrations of greenhouse gases in the atmosphere are mostly the result of human actions, and are major causes of global warming.

Global Warming Facts:
Global Warming Causes

Fact

The causes of global warming can be both natural and human-induced.

 

sun, sunset

Photo: Flickr.com

 

Fact

The natural sources of the Earth's warming are:

  • increases in the energy output of the sun (as the original source of all energy received by the planet), and
  • changes in the Earth's orbital characteristics such as changes in the shape of the Earth’s orbit around the sun as well as the tilt of the Earth’s axis, which can change the total amount of solar energy received by the planet.

Fact

While the greenhouse gases are direct agents of global warming, industry and land use are its fundamental human-induced causes.

greenhouse gases

Global Warming Facts:
Industry is a leading source of carbon dioxide emissions

Fact

The widespread use of fossil fuel-based sources of energy in industry, commercial and private sectors is a major source of greenhouse gas emissions. Carbon dioxide (CO2) is the main greenhouse gas released as a result of fossil fuel burning.

More Facts

Over the past 100 years, the amount of carbon dioxide in the atmosphere has increased by around 25%. (5)

Fact

Coal is the dirtiest of all fossil fuels.

Fact

Modern agricultural practices employed to breed animals, grow cereals, fruits & vegetables and other foods make land use another significant source of greenhouse gas emissions. The main gases released are methane (CH4) and nitrous oxide (N2O).

deforestation, amazon

Global Warming Facts:
Amazon deforestation -
another source of CO2 emissions

Photo: Leonardo F. Freitas

More Facts

17% of all the fossil fuel used in the US in year 2002 went into food production.

Between 1950 and 2002, world meat production went from 44 mln. to 242 mln. tons a year.

Animal agriculture is responsible for 35-40% of all methane generated by human activity. As of 2007, animal agriculture produced around 100 mln. tons of methane a year. (6)

Fact

Deforestation is an unwanted by-product of land use activities in tropical countries. It is a source of large amounts of carbon dioxide (CO2) being released into the atmosphere, especially if forest fires are used to clear land for different purposes.

Fact

The contribution of the 3 main greenhouse gases released by human activities to the total temperature rise over the next 100 years is projected to be:

  • carbon dioxide – 72%
  • methane – 19%
  • nitrous oxide – 9%

Global Warming Facts:
Global Warming Effects

The following global warming effects have already been recorded, or projected to take place in the future.

 

Fact

Extreme weather events

katrina hurricane

Global Warming Facts:
Hurricane Katrina (2005) may have
been boosted by global warming

Photo: Flickr.com
  • Floods
  • Droughts
  • Heat waves
  • Extreme winter cold and snow fall
  • Tornadoes
  • Extreme storms
  • Tropical cyclones / hurricanes / typhoons

More Facts

Tropical cyclones only develop at tropical latitudes when sea surface temperatures exceed 27°C.

The energy released by a single tropical cyclone in one day would be enough to power the entire industrial production of the US for one year. (7)

Fact

Potential changes to climate patterns

 
  • Polar region of Northern Hemisphere to be hit hardest by rising temperatures
  • Lands to experience greater warming than oceans
  • Increased precipitation in polar and subpolar regions
  • Decreased precipitation in middle latitudes
  • Oceans to continue to warm for several centuries due to greenhouse concentrations which have already taken place
sea level

Global Warming Facts:
Sea levels could rise
Photo: Storm Crypt

Effects on global sea levels

Fact

Global sea levels are expected to increase further along with temperature increases.

Fact

An increase of 2°C would cause complete melting of Greenland ice sheet and would cause global sea level to rise by 5 – 6 meters. This would submerge many islands and lowland regions, ex. US Gulf Coast, much of the Netherlands and Belgium, major cities – Tokyo, New York, Mumbai, Shanghai, Dhaka.

Fact

Complete loss of the West Antarctic ice sheet (if it were to occur) would lead to a 10.5 m rise in the global sea level.

Effects on physical environment

central coast flood, australia

Global Warming Facts:
Central Coast Flooded
Australia

Photo: Lincoln De Kalb

Fact

Coastal areas are the parts of the planet that are most vulnerable to the effects of global warming. Rising sea levels would flood many of these lands and negatively affect humans populations inhabiting them. Some island nations would likely need to re-locate altogether.

More Facts

Governments of several island countries are already being forced to think of complete relocation of their populations to other, safer lands. This, for example, is the case for the nations of Kiribati (located in the Pacific Ocean) and the Maldives (located in the Indian Ocean).

Fact

Forests may be lost because of the warmer and drier climate conditions, and otherwise badly affected by global warming, ex. through the growth of pests encouraged by warmer temperatures. Forests themselves may contribute to global warming when they are destroyed, especially by way of forest fires which lead to the release of large amounts of CO2 into the atmosphere.

dry forest, coorg india

Global Warming Facts:
Dry Forest, Coorg, India
Photo: Ram Prasanth

Fact

Mountains will experience the melting of their snow cover and retreat and disappearance of glaciers. This will reduce the availability of water that runs off from glaciers during the warmer summer months, thus affecting irrigation of crops and drinking water supplies.

Fact

Oceans are the largest carbon sinks in the world. The increased concentrations of carbon dioxide in the atmosphere force the oceans to absorb more and more of this greenhouse gas. This process has led to ocean acidification which has been blamed for damaging coral reefs and other shell-forming organisms.

coral reefs, thailand

Global Warming Facts:
Global warming
may destroy coral reefs

Photo: Jon Hanson

More Facts

Oceans hold 50 times more carbon dioxide than the atmosphere.

They absorb 30-40% of the carbon dioxide produced by human activity. (8)

Fact

Permafrost will also be affected by warmer temperatures. It is expected to "thasw", release significant amounts of methane into the atmosphere and therefore further contribute to global warming.

Effects on Biodiversity & Animals

 

Fact

Many animal species face a risk of extinction exacerbated by global warming. This, for example, can happen indirectly through the loss of habitat or directly by contracting deadly heat-induced diseases.

bees, flower, february, early spring

Global Warming Facts:
Spring comes early for bees
February, 2007

Photo: Joe Dunckley

Fact

Animals may also be affected by reduced availability of food and water as a consequence of global warming.

Fact

Other effects on animals & plants include:

  • Earlier leaf production by trees
  • Earlier greening of vegetation
  • Changed timing of egg-laying and hatching
  • Changes in migration patterns of birds, fish and other animals
  • Reductions and re-distributions in populations of algae and plankton; this threatens the existence of fish and other animals that rely on algae and plankton for food

Effects on Humans

 

Fact

The warmer climate will lead to the reduced availability of water supplies which are crucial for the well-being of human populations.

dead land, drought, lack of water

Global Warming Facts:
Dead Land
Photo: Fatih Kocaman

More Facts

Droughts and the lack of sufficient water supplies have already caused possibly one of the worst conflicts in modern human history which occurred in an African country of Sudan, specifically the Darfur region.

The conflict, that started in 2003, was preceded by decades of drought, desertification and overpopulation in this country. This situation forced members of the Arab Baggara tribes searching for water for their livestock to travel south, the land populated by non-Arab farming communities, and fight for scarce resources.

It is estimated that this war resulted in at least 450,000 deaths.

Fact

The water quality will also be compromised by heavy precipitation events which may contaminate drinking water supplies.

Fact

Temperature rises will cause low productivity yields for food supplies.

rice harvest, bangladesh

Global Warming Facts:
Global warming
may reduce rice crop yields

Photo: Michael Foley

Fact

Extreme weather events such as droughts and floods will be destroying agricultural crops.

Fact

Heat-induced spread of viruses & bacteria will make human health another victim of global warming.

More Facts

About 45 percent of the world's population currently lives in areas where the climate is potentially suitable for malaria transmission, and as the planet continues to warm that proportion could increase to 60 percent by century's end. (9)

flood, children, cambodia

Global Warming Facts:
Flood in Cambodia
Photo: Sean

Fact

Extreme events such as heat waves, floods and tropical cyclones will be a major cause of human deaths.

More Facts

The summer of 2003 in Europe was the hottest since 1500, and in August of that year the heat wave killed 20,000 people in France and thousands more in other parts of Europe. (10)

Fact

Many millions will suffer from malnutrition because of shortages in food supply which will lead to weakened immune systems and general health deterioration.

hungry children, malnutrition, indonesia

Global Warming Facts:
Malnutrition
Photo: Kent Clark

Fact

Habitat loss may be another severe impact of global warming on coastal communities.

Fact

By 2000 global warming was already responsible for 150,000 excess deaths annually. It has been calculated that by 2020 it could kill 300,000 people around the world every year. (11)

You can learn more about global warming from our other related articles. Please see the links to many of them at the bottom of this page.

This article is based on the following previously published articles:
What is Global WarmingGlobal Warming Causes
Global Warming Effects
See here for other specific references for this article

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