Nearly all of the world's countries have announced targets for reducing their greenhouse gas emissions.
However, despite the now-stated targets, emissions will continue to increase up to 2030, and global temperature increase can be kept below the critical two degree limit only if drastic emission reductions are carried out after 2030.
"The rate of emission reductions required after 2030 might not be realistic anymore, and therefore it is critically important to make the current emission targets for 2030 more ambitious," said Tommi Ekholm, Senior Scientist at VTT Technical Research Centre of Finland.
The countries that have set an emissions reduction target represent more than 90 per cent the global greenhouse gas emissions, 89 per cent of the global population and 95 per cent of the economic production.
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The results of the study provide an important basis for discussion for the Paris Climate Conference that started on Monday.
According to the United Nations Framework Convention on Climate Change (UNFCCC), the richest countries will assume a leading role in the emissions reductions.
The comparison shows that all developed countries have promised to reduce emissions by 20-30 per cent from the current level. In contrast, the targets of developing countries vary considerably.
"Some of the developing countries aim at emissions reductions or a small increase at most, whereas the target of some countries would lead to a tripling of emissions from the current level," said Ekholm.
The fourth largest emitter is population-rich India, whose emissions per person would double to 4.2 tonnes of carbon dioxide, the researchers said.