WASHINGTON: The time for talking is over, the world needs to act now, PM Narendra Modi said at the UN Climate Action Summit on Monday.“We must accept that if we have to tackle the climate crisis, what we are doing today isn’t enough. What we need is a global behavioural change,” he added, urging world leaders to act immediately to protect the environment.The unexpected appearance of Donald Trump during Modi’s speech created a flutter. Trump dropped in just as Modi was speaking, listened intently, and applauded some of his remarks. He left soon after the next speaker, Germany’s Angela Merkel , finished. While Modi has positioned himself as a climate warrior, the US president is a climate change sceptic who pulled the US out of the Paris Agreement.While Trump’s presence at the climate change summit triggered speculation of a possible change of heart, the likelier explanation for his presence is that it was meant as another show of support for Modi, with whom he put on a great show of bonhomie in Houston on Sunday – this time on his home turf in New York.Fully expressing India’s bragging rights for installing solar panels on the roof of the UN that he will inaugurate tomorrow, Modi said India would lead by example to forestall catastrophic developments. “Need, not greed has been our guiding principle. People’s movement is the need of the hour,” Modi said, announcing India’s decision to ban single-use plastic and hoping this would raise awareness of single-use plastic at the global level.“An ounce of practice is worth more than a ton of preaching,” he said in English in a brief address that was mainly in Hindi. He said India is going to increase the share of non-fossil fuel in its fuel mix and renewable energy capacity to 175 gigawatts by 2022, and further onwards to 450 gigawatts.Trump and Modi arrived in New York after meeting Sunday in Houston where the US and India pledged a fossil fuel (mainly LNG) supply and demand relationship stretching over the next 40 years.