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The world's 10 biggest polluters
1. China
China is the world's worst polluter nation with the highest overall annual emission of greenhouse gases (6,018 million tonne). However, in terms of per capita emissions it is ranked 44th in the world, emitting 4.5 tonne (per person).
It has a renewable energy target (15 per cent of total energy by 2020) and an energy efficiency target (20 per cent reduction by 2010). China has pledged to cut its carbon intensity goal by 40-45 per cent by 2020.
Meanwhile, Australia has the world's highest per capita carbon dioxide emissions from energy use, according to the Maplecroft's CO2 Energy Emissions Index. An average Australian emitted 20.58 tonne of carbon dioxide a year.
Canada was third, followed by the Netherlands and Saudi Arabia. The list of nations most vulnerable to the effects of climate change was topped by Somalia, followed by Haiti and Afghanistan.
China, India, Brazil and South Africa had rejected a Danish suggestion earlier to set a goal of halving world emissions by 2050, saying that rich nations must first set a model by cutting their emissions.
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The United States is the second worst per capita carbon emitter with for 19.78 tonne of emission per person. America is also ranked the world's second highest polluter with 5,903 million tonns of carbon dioxide emission.
President Barack Obama plans to cut emissions by 17 per cent from 2005 levels by 2020. The world's eyes will be on him when he addresses the Copenhagen summit on climate change next week.
The world's 10 biggest polluters
Russia is ranked third with 1,704 million tonnes of carbon dioxide emission. Russia is ready to slash its greenhouse gas emissions by as much as 25 per cent, if other countries follow suit.
The world's 10 biggest polluters
But with a rising population, the figures are likely to rise further. The government said it is ready to cut the amount of carbon dioxide (CO2) emitted per unit of economic output -- by between 20 and 25 per cent by 2020 from the 2005 levels.
The world's 10 biggest polluters
Japan comes next in the list with 1,247 million tonne of carbon emission.
However, the greenhouse gas pollution fell by 6.2 per cent in Japan in the last financial year. Japan plans to slash greenhouse gas emissions by 25 per cent from 1990 levels by 2020 if developed countries take significant initiatives.
The world's 10 biggest polluters
The world's 10 biggest polluters
Canada which emits 18.81 tonne of carbon per person is the world 7th worst polluter, with an absolute carbon emmission of 614 million tonne.
Canada now plans to reduce emissions by 20 per cent compared with 2006 levels by 2020.
The world's 10 biggest polluters
8. United Kingdom
The Uniited Kingdom's emission stands at 586 million tonnes of carbon dioxide emission. The European union agreed to cut emissions by 20 per cent to 2020, compared with 1990 levels.
According to the government records, emission have dropped in the UK.
The world's 10 biggest polluters
The world's 10 biggest polluters
Iran has 471 million tonnes of carbon dioxide emission. Iran is worst hit by air and water pollution. The Caspian sea is highly polluted posing a grave threat to marine life and the ecology.