OSLO/LONDON: Plans by about 150 countries to curb greenhouse gas emissions will slow climate change this century but they need to do more to limit rising global temperatures to two degrees Celsius (3.6 Fahrenheit), the United Nations said on Friday.

Scientists say warming must be kept below 2 degrees by the end of the century to stave off the worst effects of climate change such as floods, droughts and rising sea levels.

National strategies would restrict a rise in world emissions to the equivalent of 56.7 billion tons of carbon dioxide per year by 2030, four billion less than expected without the extra action, from 49.0 billion in 2010, it said.

“It is a very good step... but it is not enough,” UN Climate Change Secretariat Christiana Figures said during a presentation of the report in Bonn.

The plans, known as Intended Nationally Determined Contributions (INDCs), will be the building blocks for a UN deal expected at a summit set for Paris from Nov. 30 to Dec. 11 to fight global warming in the years from 2020.

Figueres’ Secretariat did not formally project a likely temperature rise by 2100, because most INDCs only stretch to 2030 but she said indications from independent analysis showed the pledged reductions would limit temperatures rises at 2.7 degrees.

Almost 200 governments agreed in 2010 to limit warming to 2 degrees above pre-industrial times, meaning Paris will have to agree ways to increase action in coming years. Temperatures have already gained by about 0.9 degrees Celsius (1.6 Fahrenheit).