Global warming is 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 100 years ending in 2005. 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 probably had a small warming effect from pre-industrial times to 1950 and a small cooling effect from 1950 onward.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. hile individual scientists have voiced disagreement with some findings of the IPCC, the overwhelming majority of scientists working on climate change agree with the IPCC's main conclusions.
Climate model projections summarized by the IPCC indicate that average global surface temperature will likely rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the 21st century. 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 thousand years even if greenhouse gas levels are stabilized. The delay in reaching equilibrium is a result of the large heat capacity of the oceans.
Increasing global temperature will cause sea level to rise, and is expected to increase the intensity of extreme weather events and to change the amount and pattern of precipitation. Other effects of global warming include changes in agricultural yields, trade routes, glacier retreat, species extinctions and increases in the ranges of disease vectors.
Remaining scientific uncertainties include the amount of warming expected in the future, and how warming and related changes will vary from region to region around the globe. Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions, but there is ongoing political and public debate worldwide regarding what, if any, action should be taken to reduce or reverse future warming or to adapt to its expected consequences.

Greenpeace exists because this fragile earth deserves a voice.
It needs solutions. It needs change. It needs action.
Greenpeace is an independent global campaigning organisation that acts to change attitudes and behaviour, to protect and conserve the environment and to promote peace by:
Catalysing an energy revolution to address the number one threat facing our planet: climate change.
Defending our oceans by challenging wasteful and destructive fishing, and creating a global network of marine reserves.
Protecting the world’s ancient forests and the animals, plants and people that depend on them.
Working for disarmament and peace by tackling the causes of conflict and calling for the elimination of all nuclear weapons.
Creating a toxic free future with safer alternatives to hazardous chemicals in today's products and manufacturing.
Campaining for sustainable agriculture by rejecting genetically engineered organisms, protecting biodiversity and encouraging socially responsible farming.

From our start in 1961, WWF has worked to protect endangered species. We're ensuring that the world our children inherit will be home to elephants, tigers, giant pandas, whales and other wildlife species, as well as people.WWF safeguards hundreds of species around the world, but we focus special attention on our flagship species: giant pandas, tigers, endangered whales and dolphins, rhinos, elephants, marine turtles and great apes. These species not only need special measures and extra protection in order to survive, they also serve as umbrella species: helping them helps numerous other species that live in the same habitats. In addition to our flagship animals, we work to protect numerous species in peril around the world that live within our priority ecoregions. Large predators like snow leopards and grizzly bears, migratory species like whooping cranes and songbirds, and a host of other species facing threats also benefit from WWF's conservation efforts. Our wildlife trade experts at TRAFFIC work to ensure that trade in wildlife products doesn't harm a species, while also fighting against illegal and unsustainable trade.WWF is known for acting on sound science. Science leads and guides our strategies and approaches, from the best way to restore tigers in viable, breeding populations to deciding which areas need protection the most.

ONE is Americans of all beliefs and every walk of life - united as ONE - to help make poverty history. We are a campaign of over 2.4 million people and growing from all 50 states and over 100 of America's most well-known and respected non-profit, advocacy and humanitarian organizations. As ONE, we are raising public awareness about the issues of global poverty, hunger, disease and efforts to fight such problems in the world's poorest countries. As ONE, we are asking our leaders to do more to fight the emergency of global AIDS and extreme poverty. ONE believes that allocating more of the U.S. budget toward providing basic needs like health, education, clean water and food would transform the futures and hopes of an entire generation in the world's poorest countries.
ONE is nonpartisan; there's only one side in the fight against global AIDS and extreme poverty.The goal of ending poverty may seem lofty, but it is within our reach if we take action together as one. You can start now by joining the ONE Campaign and pledging your voice to the fight against extreme poverty and global AIDS.