the UK we have seen 4 out of 5 of the hottest years ever recorded
over a 330-year period in the last 10 years. These are startling
statistics. This warming is due, at least in part, to the increasing
concentrations of greenhouse gases in the atmosphere.
| Global warming is no longer a theory. Since the 1970s, the world has warmed by about 0.15 °C per decade, and 1998 was the warmest year on record. The evidence is mounting. Globally 1998 was the hottest year ever recorded and 9 out of the 10 hottest years ever recorded have fallen in the last decade.
The world is now warmer than at any time since the last Ice Age
Temperatures have risen faster in the last hundred years than ever
before. This is called global warming. As a consequence, you may
have heard people making all sorts of guesses about how high the
seas will rise.
warming is caused by a blanket of 'greenhouse gases' building
up around the earth trapping heat from the sun. The earth is
kept warm and able to support life by the solar energy from
the sun. This energy arrives in the form of short wave radiation
most of which passes through the atmosphere to warm the earth's
surface. The earth must be able to return energy into space
at the same rate at which it absorbs energy in order not to
The energy being returned to space is in the form of infra-red
radiation and does not pass directly through the atmosphere.
Carbon Dioxide production by Sector
the atmosphere, the stratosphere and mesosphere are cooling
faster than anybody thought. The heat trapped by the greenhouse
gases in the lower troposhere causes the cooling. This is called
radioative cooling and may be the "miner's canary" - the latest
and largest sign that things are wrong. The cooling also creates
more ice particles encouraging further ozone depletion.
Lots of processes that influence the climate occur as the energy
is transported through the atmosphere, it is absorbed by water
vapour, carbon dioxide, methane, nitrous oxide and other natural
'greenhouse gases'. These gases act like a blanket around the
Human activity is adding to these greenhouse gases. During the last
hundred years vast stores of coal, oil and gas have been burnt that
took millions of years to form. We have burnt fossil fuels faster
than ever before releasing lots of carbon dioxide. Methane and nitrous
oxide are emitted from other sources such as keeping cattle and growing
the world pumps about 31,000 million tonnes of carbon and about 250
million tonnes of methane into the atmosphere. Vegetation and oceans
absorb approximately half the carbon and 4/5ths of the methane produced,
the remainder contribute to climate change and global warming.
main greenhouses gases are :
- Carbon dioxide mainly from burning fossil fuels.
- Chlorofluorocarbons (CFCs) used for propellants, foam
plastics, refrigerants and solvents
- Nitrous oxides mainly from fossil fuels, industries, households,
cement manufacture and burning rainforests
- Methane from cattle ranching, coal mines and paddy fields
Worldwide emissions of CO2 from burning fossil fuels grew
by 1.2% in 1997compared to 2.8% in 1996. Half comes from
the top five emitters.
Have a look at Beginner's Guide to the UN Framework Convention and
its Kyoto Protocol at http://www.unep.ch/iuc/submenu/begin/beginner.htm
1988, international forecasts of the threat posed by global warming
have been revised downward a number of times, from 0.8C/decade in
1988 to 0.2C/decade in 1995, resulting in a sea level rise of 5-35
cm instead of 20 - 150 cm.
regions such as Europe, North America and Japan have been responsible
for most of the increase in greenhouse gases by the energy used
to create and maintain the wealth and standard of living. More
people are demanding better food, cleaner water, more electricity,
more consumer goods increasing the demand for even more energy
use. Developing countries want economic growth, the ability
to expand their industries and their people aspire to a quality
of life comparable with developed nations.
Health Effects of Climate Change The WHO and World Resources
Institute consider that as many as 700,000 lives could
be saved annually by accepting a 15% reduction in the
greenhouse gases from 1990 level. Otherwise deaths will
come from new infectious diseases on top of increases
in malaria and cholera
People are realising that the consequences of what was happening would
affect the world long before the seas started to rise. The mixture
of possible events is called climate change.
Climate changes could have enormous consequences such as:
are many arguments about climate change. This is not surprising as
there are many vested interests in the debate.
- food shortages as crops fail as a result of shorter wet winters
and long dry summers
- violent storms and more hurricanes
- new pests and diseases
- melting of icecaps
- flooding of low lying areas as sea levels rise
- extinction of many plants and animals as conditions change.
The UK has gathered together the first set of indicators that
are influenced by climate. These indicators cover climate such
as temperature and rainfall but also include environmental and
economic pointers such as risk of flooding, egg-laying dates
of birds, abundance of butterflies and effects on the Scottish
March temperatures have become warmer in recent years
This is reflected in consistently earlier laying by both
Robins and Chaffinches. Years with particularly warm March
temperatures occurred in 1957, 1959, 1961, 1981 and 1990,
often with correspondingly early laying by both species.
Check out Indicators of Climate Change in the UK by visiting
from Britain's Hadley Centre for Climate Change were presented to
170 countries at the Fourth UN Conference of Parties in Buenos Aires.
They showed that parts of the Amazon will be desert by 2050, threatening
the world with an unstoppable greenhouse effect. The computer at the
Hadley Centre shows the earth is heating up fast, with 1988 already
the hottest year since records began.
Among the findings are :
check out: http://www.met-office.gov.uk/sec5/
temperatures will go up 6C by the end of the next century
number of people on the coast subject to flooding will rise from
5 million now to 100 million by 2050
30 million people will be hungry in 50 years because of drought
extra 170 million people will live in countries with extreme water
These new calculations make far better estimates for ocean currents.
El Nino and latterly La Ninya have been stronger and longer than any
previous Pacific climate changes.
The Dept of Environment's Climate Change Impacts Review Group in 1996
believed that the most probable change in the UK would be about 0.2
C per decade, but slightly slower in the north and west. Very warm
seasons would become more frequent, while rainfall will increase -
5% in the 2020 and 10% by 2050s. Summer rain will decline in the south
and east, and increase in the north and west. Wind will increase and
gales increase by 30% by 2050.
The principle impacts will be:
- Soil in the south become more droughty
- Wildlife migrate north
- Arable areas likely to move north
- Forest species increase in north, but beech in the south may
- Higher wind speeds will affect the design industry
- Increased claims for insurers
- Increasing incidence of infectious diseases and heat induced
The Intergovernmental Panel on Climate Change (IPCC) was established under the United Nations General Assembly (UNEP). They assess the evidence and present their finding to a series of UN Conferences under the UN Convention on Climate Change.
Under the 'Kyoto Protocol' countries are set various targets to reduce emissions across the world. However, the USA, Australia, and now Russia are not ratifying the protocol. This means, despite EU pressure, 'Kyoto' is unlikely to have much effect.
What to do instead? Check the NEF "Free Riding on the Climate". They propose using the WTO to challenge those economies that have the hidden 'subsidies' of not meeting these targets.
| Micheal Meacher the then UK Environment Minister said at Buenos Aires. "Combating climate change is the greatest challenge of human history".
UK government's "Climate Change"