The summit is being held under the shadow of the deadly Paris terror attacks that killed 130 people two weeks ago. About 2,800 police and soldiers will secure the conference site and more than 6,000 have been deployed in the city.

Besides Modi, other leaders including US President Barack Obama, China's Xi Jinping and Russia's Vladimir Putin will attend the opening ceremony of the 21st Conference of the Parties (COP21) tasked with reaching the first truly universal climate pact.

The 12-day Paris climate conference will, for the first time in over 20 years of UN negotiations, aim to achieve a legally binding and universal agreement on climate, with the aim of keeping global warming below 2°C over pre-industrial temperatures.

Before the talks, countries like China and India have laid out plans for cuts or curbs to their emissions. These will form the centre piece of any deal.

Twenty countries, including India, the US and China, have already decided to launch an initiative to double their clean energy research and development budget over the next five years as part of global efforts to tackle climate change.

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