Я:
Результат
Архив

МЕТА - Украина. Рейтинг сайтов Webalta Уровень доверия



Союз образовательных сайтов
Главная / Предметы / Экология / Climate change


Climate change - Экология - Скачать бесплатно


Report on The State Department Climate Action: Introduction and Overview


                          International Activities


    No single country can resolve the problem  of  global  climate  change.
Recognizing this, the  United  States  is  engaged  in  many  activities  to
facilitate  closer  international  cooperation.  To  this  end,   the   U.S.
government  has  actively  participated  in   international   research   and
assessment efforts (e.g., through the  IPCC),  in  efforts  to  develop  and
implement a global climate change strategy (through the FCCC  Conference  of
the Parties and  its  varied  subsidiary  bodies  and  through  the  Climate
Technology Initiative), and by providing financial and technical  assistance
to  developing  countries  to  facilitate  development  of  mitigation   and
sequestration strategies (e.g.,  through  the  Global  Environment  Facility
(GEF)).  Bilateral  and  multilateral  opportunities  are  currently   being
implemented,  with  some  designed  to  capitalize  on   the   technological
capabilities of the private sector, and others to work on  a  government-to-
government basis.
    In the existing Convention framework, the United  States  has  seconded
technical experts to the FCCC secretariat to help implement  methodological,
technical,  and  technological  activities.  U.S.  experts  review  national
communications of other Parties and are helping to advance  the  development
of methodologies for inventorying national emissions.
    The United States has been active in promoting  next  steps  under  the
Convention. It has encouraged all countries to take appropriate analyses  of
their  own  circumstances  before  taking  action--and  then  act  on  these
analyses. It has suggested--and, where possible, has  demonstrated--flexible
and robust institutional systems through which actions can  be  taken,  such
as programs  to  implement  emission-reduction  activities  jointly  between
Parties, and emission-trading programs. The United States  has  also  sought
to use its best diplomatic  efforts  to  prod  those  in  the  international
community reluctant to act, seeking to provide assurances that the issue  is
critical and warrants global attention. Through these efforts,  the  ongoing
negotiations are  expected  to  successfully  conclude  in  late  1997.  The
successful implementation of the Convention and a new legal instrument  will
ensure that the potential hazards of climate change will never be  realized.

    As a major  donor  to  the  GEF,  the  United  States  has  contributed
approximately  $190  million  to  help   developing   countries   meet   the
incremental costs of protecting the global environment. Although the  United
States is behind in the voluntary payment schedule agreed  upon  during  the
GEF replenishment adopted in 1994, plans have been made  to  pay  off  these
arrears.
    The principles of the U.S. development assistance strategy lie  at  the
heart of U.S. bilateral mitigation projects. These  principles  include  the
concepts of conservation and cultural respect, as  well  as  empowerment  of
local citizenry. The  U.S.  government  works  primarily  through  the  U.S.
Agency for International Development (USAID). In fact, mitigation of  global
climate change is one of USAID's two global environmental priorities.  Other
agencies working in the climate change field,  including  the  Environmental
Protection Agency, the National Oceanic and Atmospheric Administration,  and
the Departments of Agriculture and Energy, are also active  internationally.
Projects fit  into  various  general  categories,  such  as  increasing  the
efficiency  of  power   operation   and   use,   adopting   renewable-energy
technologies, reducing air pollution, improving agricultural  and  livestock
practices, and decreasing deforestation and improving land use.
Perhaps none of the U.S. programs is as  well  known  as  the  U.S.  Country
Studies Program. The program is currently  assisting  fifty-five  developing
countries and countries with economies in  transition  to  market  economies
with climate change  studies  intended  to  build  human  and  institutional
capacity to address climate change. Through its Support for National  Action
Plans, the program is supporting the preparation of national climate  action
plans for eighteen developing countries, which will lay the  foundation  for
their national communication, as required by the  FCCC.  More  than  twenty-
five  additional  countries  have  requested  similar  assistance  from  the
Country Studies Program.
The United States is also committed to facilitating the commercial  transfer
of  energy-efficient  and  renewable-energy  technologies  that   can   help
developing countries achieve sustainable development. Under the auspices  of
the Climate Technology Initiative, the U.S. has taken a lead role in a  task
force on Energy Technology Networking and Capacity Building, the efforts  of
which focus on  increasing  the  availability  of  reliable  climate  change
technologies, developing options for improving access to data in  developing
countries, and supporting experts in the field around the world. The  United
States is also engaged in various other projects intended to help  countries
with mitigation and adaptation issues. The International Activities  chapter
focuses on the most important of these U.S. efforts.


                          Introduction and Overview


    Since the historic gathering of representatives from 172  countries  at
the Earth Summit in Rio de Janeiro in June  1992,  issues  of  environmental
protection have remained high  on  national  and  international  priorities.
Climate change is one of the most visible of these issues--and one in  which
some of the most significant progress has been made since the 1992  session.
Perhaps the crowning achievement in Rio  was  the  adoption  of  the  United
Nations Framework Convention  on  Climate  Change  (FCCC).  This  Convention
represented a shared commitment by nations around the world  to  reduce  the
potential risks of  a  major  global  environmental  problem.  Its  ultimate
objective is to:
    Achieve  ј  stabilization  of  greenhouse  gas  concentrations  in  the
atmosphere at a level  that  would  prevent  dangerous  anthropogenic  human
interference with the climate  system.  Such  a  level  should  be  achieved
within a time frame sufficient to allow ecosystems  to  adapt  naturally  to
climate change, to ensure that food production is  not  threatened,  and  to
enable economic development to proceed in a sustainable manner.
    However, since the 1992 Earth Summit, the global  community  has  found
that actions to mitigate climate change will  need  to  be  more  aggressive
than anticipated. At the same time, the  rationale  for  action  has  proven
more compelling. Few "Annex I" countries (the Climate Convention's term  for
developed countries, including Organization  for  Economic  Cooperation  and
Development  (OECD)  member  countries  and  countries  with  economies   in
transition to market economies) have demonstrated an  ability  to  meet  the
laudable, albeit nonbinding, goal of the  Convention--"to  return  emissions
of greenhouse gases to their 1990 levels by the end of  the  decade."  While
voluntary  programs  have  demonstrated  that  substantial  reductions   are
achievable at economic savings or low costs, the success of  these  programs
has been overshadowed  by  lower-than-expected  energy  prices  as  well  as
higher-than-expected economic growth and  electricity  demand,  among  other
factors.
    Recognizing that even the  most  draconian  measures  would  likely  be
insufficient to reverse the growth  in  greenhouse  gases  and  return  U.S.
emissions to their 1990 levels by  the  year  2000,  new  U.S.  efforts  are
focusing most intensively on the post-2000  period.  Thus,  while  some  new
voluntary actions have already been  proposed  (and  are  included  in  this
report), an effort to develop a  comprehensive  program  to  address  rising
U.S. greenhouse gas emissions is being  developed  in  the  context  of  the
ongoing  treaty  negotiations  and  will  be  reported  in  the  next   U.S.
communication.
    In spite of difficulties in meeting a domestic goal to return emissions
to their 1990 levels, the U.S. commitment to addressing the  climate  change
problem remains a high priority.  President  Clinton,  in  remarks  made  in
November 1996, both underlined U.S. concerns and  exhorted  the  nations  of
the world to act:
       “We must work to reduce  harmful  greenhouse  gas  emissions.  These
   gases released by cars and power plants and burning  forests  affect  our
   health and our climate. They are literally warming our  planet.  If  they
   continue unabated, the consequences will be nothing short of  devastating
   ј. We must stand  together  against  the  threat  of  global  warming.  A
   greenhouse may be a good place to raise plants; it is no place to nurture
   our children. And we can avoid dangerous global warming if we begin today
   and if we begin together.”
    Difficulties in meeting the "aim" of the  Climate  Convention  prompted
the  international  community,  gathered  at  the  first  meeting   of   the
Conference of the Parties to the FCCC (held in  Berlin,  Germany,  in  March
1995), to agree on a new approach to addressing the climate change  problem.
At their first session,  the  Parties  decided  to  negotiate  a  new  legal
instrument containing appropriate next steps under the  Convention.  At  the
Second Conference of the Parties (COP-2), the United  States  expressed  its
view that the new agreement should include three main elements:
a realistic and achievable binding target (instead of  the  hortatory  goals
and nonbinding aims of the existing Convention),
flexibility in implementation, and
the participation of developing countries.
    Each of these elements was included in a Ministerial Declaration agreed
to at  COP-2,  and  the  United  States  expects  that  a  legal  instrument
containing these elements will  be  one  of  the  outcomes  from  the  Third
Conference of the Parties, to be held in Kyoto, Japan, in December 1997.
    As international negotiations continue on a new legal  commitment,  the
United States is assessing options for a domestic program.  The  results  of
this analytical effort  are  being  used  to  inform  the  U.S.  negotiating
positions, and will subsequently be used to  develop  compliance  strategies
to meet any commitments established under the new regime.
    While the Parties involved in the  negotiations  are  determining  next
steps for collective action, all countries are still actively  pursuing  the
programs adopted earlier in the decade to control emissions.  This  document
describes the current U.S. program. It represents  the  second  formal  U.S.
communication under the FCCC, as required under  Articles  4.2  and  12.  As
with the Climate Action Report published by the United States  in  1994,  it
is a "freeze frame"--a look at the  current  moment  in  time  in  the  U.S.
program. This report does not predict additional future activities.  Nor  is
it intended to be  a  substitute  for  existing  or  future  decision-making
processes--whether  administrative   or   legislative--or   for   additional
measures developed by or with the private sector.
    This document has been developed using  the  methodologies  and  format
agreed to at the first meeting of the  Conference  of  the  Parties  to  the
FCCC, and modified by the second meeting of the Conference  of  the  Parties
and by sessions of  the  Convention's  Subsidiary  Body  on  Scientific  and
Technological Advice and the Subsidiary Body on Implementation.  The  United
States assumes that this communication, like those of  other  countries--and
like the  preceding  U.S.  communication--will  be  subject  to  a  thorough
review, and discussed in the evaluation  process  for  the  Parties  of  the
Convention. Even though the measures listed in this report are not  expected
to reduce U.S. emissions below 1990 levels by  the  year  2000,  the  United
States believes that many of the climate change  actions  being  implemented
have been successful at reducing emissions, send  valuable  signals  to  the
private sector, and may be appropriate models for other countries. The  U.S.
experience should also ensure that future  efforts  are  more  effective  in
reversing the rising trend of emissions  and  returning  U.S.  emissions  to
more environmentally sustainable levels.



                                 The Science


    The 1992 Convention effort was largely predicated on the scientific and
technical information produced by the  Intergovernmental  Panel  on  Climate
Change (IPCC) in its 1990  report.  The  IPCC  consists  of  more  than  two
thousand of the world's best scientists  with  expertise  in  the  physical,
social, and economic sciences relevant to  the  climate  issue.  The  United
States stands firmly behind the IPCC's conclusions.  As  the  actions  being
taken by the United States ultimately depend on the  nation's  understanding
of the science, it is important to at least briefly review this  information
here.
    The Earth absorbs energy from the sun in the form of  solar  radiation.
About one-third  is  reflected,  and  the  rest  is  absorbed  by  different
components of the climate system, including the atmosphere, the oceans,  the
land surface, and the biota. The incoming energy is balanced over  the  long
term by outgoing radiation from the Earth-atmosphere system,  with  outgoing
radiation taking the form  of  long-wave,  invisible  infrared  energy.  The
magnitude of this outgoing radiation is affected in part by the  temperature
of the Earth-atmosphere system.
    Several human and natural activities can change the balance between the
energy absorbed by the Earth and that  emitted  in  the  form  of  long-wave
infrared radiation. On the natural side,  these  include  changes  in  solar
radiation (the sun's  energy  varies  by  small  amounts--approximately  0.1
percent over an eleven-year cycle--and variations over longer  periods  also
occur). They also include  volcanic  eruptions,  injecting  huge  clouds  of
sulfur-containing  gases,  which  tend  to  cool  the  Earth's  surface  and
atmosphere over a few years. On the human-induced side, the balance  can  be
changed by emissions from land-use changes  and  industrial  practices  that
add  or  remove  "heat-trapping"  or  "greenhouse"  gases,   thus   changing
atmospheric absorption of radiation.
    Greenhouse gases of policy significance include carbon  dioxide  (CO2);
methane (CH4); nitrous  oxide  (N2O);  the  chlorofluorocarbons  (CFCs)  and
their  substitutes,  including  hydrofluorocarbons  (HFCs);  the  long-lived
fully fluorinated hydrocarbons, such as perfluorocarbons (PFCs);  and  ozone
(O3). Although most of these gases occur naturally (the exceptions  are  the
CFCs, their substitutes, and the long-lived  PFCs),  the  concentrations  of
all of these gases are changing as a result of human activities.
    For example, the atmospheric concentration of carbon dioxide has  risen
about 30 percent since the 1700s--an  increase  responsible  for  more  than
half of the enhancement of the trapping of the  infrared  radiation  due  to
human  activities.  In  addition  to  their  steady  rise,  many  of   these
greenhouse gases have long atmospheric residence times (several  decades  to
centuries), which means that atmospheric levels of these gases  will  return
to preindustrial levels only if emissions  are  sharply  reduced,  and  even
then only after a long  time.  Internationally  accepted  science  indicates
that increasing concentrations of greenhouse gases  will  raise  atmospheric
and oceanic temperatures and could alter associated weather and  circulation
patterns.
    In a report synthesizing its second  assessment  and  focusing  on  the
relevance of its scientific  analyses  to  the  ultimate  objective  of  the
Convention, the IPCC concluded:
Human activities--including the burning  of  fossil  fuels,  land  use,  and
agriculture--are changing the atmospheric composition. Taken together,  they
are projected to lead to changes in global and regional climate and climate-
related parameters, such as temperature, precipitation, and soil moisture.
Some  human  communities--particularly  those   with   limited   access   to
mitigating technologies--are becoming more  vulnerable  to  natural  hazards
and can be expected to suffer significantly from  the  impacts  of  climate-
related changes, such as  high-temperature  events,  floods,  and  droughts,
potentially resulting in fires,  pest  outbreaks,  ecosystem  loss,  and  an
overall reduction in the level of primary productivity.
          The IPCC  also  concluded  that,  given  the  current  trends  in
      emissions, global concentrations of greenhouse  gases  are  likely  to
      grow significantly through  the  next  century  and  beyond,  and  the
      adverse impacts from these changes will become greater. The  remainder
      of this report seeks to elucidate the programs, policies, and measures
      being taken in the United States to begin moving away from this  trend
      of increasing emissions, and to help move  the  world  away  from  the
      trend of globally increasing concentrations of greenhouse gases.

|Principal Conclusions of the IPCC's Second Assessment Report         |
|While the basic facts about the science of climate have been         |
|understood and broadly accepted for years, new information is        |
|steadily emerging--and influencing the policy process. In 1995, the  |
|IPCC released its Second Assessment Report, which not only validated |
|most of the IPCC's earlier findings, but because of the considerable |
|new work that had been undertaken during the five years since its    |
|previous full-scale assessment, broke new ground. The report is      |
|divided into three sections: physical sciences related to climate    |
|impacts; adaptation and mitigation responses; and cross-cutting      |
|issues, including economics and social sciences.                     |
|The Climate Science                                                  |
|Human activities are changing the atmospheric concentrations and     |
|distributions of greenhouse gases and aerosols.                      |
|Global average temperatures have increased about 0.3-0.6°C (about    |
|0.5-1.0°F) over the last century.                                    |
|The ability of climate models to simulate observed trends has        |
|improved--although there is still considerable regional uncertainty  |
|with regard to changes.                                              |
|The balance of evidence suggests there is a discernible human        |
|influence on global climate.                                         |
|Aerosol sulfates (a component of acid rain) offset some of the       |
|warming by greenhouse gases.                                         |
|The IPCC mid-range scenario projects an increase of 2.0°C (3.7°F) by |
|2100 (with a range of 1.0-3.5°C (about 1.8-6.3°F).                   |
|The average global warming projected in the IPCC mid-range scenario  |
|is greater than any seen in the last ten thousand years.             |
|Sea level is projected to rise (due to thermal expansion of the      |
|oceans, and melting of glaciers and ice sheets) by about 50          |
|centimeters (20 inches) by 2100, with a range of 15-95 centimeters   |
|(about 6-38 inches).                                                 |
|Even after a stabilization of greenhouse gas concentrations,         |
|temperatures would continue to increase for several decades, and sea |
|level would continue to rise for centuries.                          |
|Vulnerability, Likely Impacts, and Possible Responses                |
|Climate change is likely to have wide-ranging and mostly adverse     |
|effects on human health. Direct and indirect effects can be expected |
|to lead to increased mortality.                                      |
|Coastal infrastructure is likely to be extremely vulnerable. A       |
|50-centimeter (20-inch) rise in sea level would place approximately  |
|120 million people at risk.                                          |
|Natural and managed ecosystems are also at risk: forests,            |
|agricultural areas, and aquatic and marine life are all susceptible. |
|                                                                     |
|However, adaptation and mitigation options are numerous. Significant |
|reductions in net greenhouse gas emissions are technically possible  |
|and can be economically feasible, using an extensive array of        |
|technologies and policy measures that accelerate technology          |
|development, diffusion, and transfer.                                |
|Socioeconomic Issues                                                 |
|Early mitigation may increase flexibility in moving toward a         |
|stabilization of atmospheric concentrations of greenhouse gases.     |
|Economic risks of rapid abatement must be balanced against risks of  |
|delay.                                                               |
|Significant "no regrets" opportunities are available in most         |
|countries. Next steps must recognize equity considerations.          |
|Costs of stabilization of emissions at 1990 levels in OECD countries |
|could range considerably (from a gain of $60 billion to a loss of    |
|about $240 billion) over the next several decades.                   |


                           National Circumstances


    In responding to the threat of global climate change, U.S. policymakers
must consider the  special  circumstances  created  by  a  unique  blend  of
challenges and opportunities. The National  Circumstances  chapter  of  this
report attempts to explain the particular situation in the  United  States--
including  its  climate,  natural  resources,  population  trends,  economy,
energy mix, and political system--as a backdrop for understanding  the  U.S.
perspective on global climate change.
    The United States is unusual in that it encompasses a wide  variety  of
climate conditions within its borders,  from  subtropical  to  tundra.  This
diversity complicates the discussion of impacts  of  global  climate  change
within the United States because  those  impacts  would  vary  widely.  This
diversity also adds to U.S. emission levels, as heating and cooling  demands
drive up emissions. Recent record levels of precipitation--both in  snowfall
and rain--consistent with what could be expected under  a  changed  climate,
have raised the awareness of climate  impacts  at  the  local  and  regional
levels, and may make it somewhat easier to predict the effects of  increased
precipitation.
    The United States also is uncommonly rich in land  resources,  both  in
extent and diversity. U.S. land area totals about 931 million hectares  (2.3
billion  acres),  including  grassland  pasture  and  range,   forest,   and
cropland. Forested land has been increasing, while grasslands and  croplands
are slowly declining and being converted  to  other  uses.  The  decline  in
wetlands has slowed significantly as a result of the "no  net  loss"  policy
being implemented.
    With just over 265 million people, the United States is the third  most
populous country in the world, 



Назад


Новые поступления

Украинский Зеленый Портал Рефератик создан с целью поуляризации украинской культуры и облегчения поиска учебных материалов для украинских школьников, а также студентов и аспирантов украинских ВУЗов. Все материалы, опубликованные на сайте взяты из открытых источников. Однако, следует помнить, что тексты, опубликованных работ в первую очередь принадлежат их авторам. Используя материалы, размещенные на сайте, пожалуйста, давайте ссылку на название публикации и ее автора.

281311062 © insoft.com.ua,2007г. © il.lusion,2007г.
Карта сайта