Norway has announced ambitious plans to achieve carbon neutrality by 2030, 20 years earlier than its previously set target.Last year the country's government revealed it was aiming to reduce its carbon emissions to zero before 2050, by a combination of reducing domestic levels of greenhouse gases and investing in emissions-trading projects.As well as increasing spending on renewable energy production and research, the plans would also see an increase in tax on both diesel fuel and petrol."The parties now think it is realistic to assume reductions in Norwegian climate gas emissions of 15-17 million metric tonnes of CO2 equivalents by 2020 when forests are included," the government said in a statement."The climate agreement gives Norway a long-term climate policy that will stand regardless of changing governments," it added.According to government figures, Norway emitted almost 54 million tonnes of carbon in 2006.