Katowice (Poland), Dec 3 (IANS): UN Secretary-General Antonio Guterres on Monday said the world was in deep trouble and not doing enough or moving fast enough to prevent irreversible and catastrophic climate disruption.

"Climate change is running faster than we are, and we must catch up sooner rather than later before it is too late," he said in his remarks at the official opening of the two-week long UN climate negotiations, known as COP24, that saw governments and delegates from nearly 200 countries in this Polish city.

"We are in trouble. We are in deep trouble with the climate change. For many, people, regions, and even countries, this is already a matter of life and death.

"This meeting is the most important gathering on climate change since the Paris Agreement was signed (in 2015)," he said.

He was categorically clear in saying "Our job here in Katowice is to finalise the Paris Agreement Work Programme -- the rule book for implementation. I remind all parties that this is a deadline you set for yourselves."

The rule book will govern national pledges to keep the rise in global temperature to under 1.5 degrees Celsius, and ensuring adequate finances to developing nations.

Climate experts told IANS that the priority outcome at the 24th Conference of the Parties to the United Nations Framework Convention on Climate Change (COP24) will be the finalisation of the 'Paris rule book', a Bible for transparent implementation of the 2015 Paris Agreement -- the first global treaty to reduce emissions by all rich and poor nations.

The COP24 negotiations with the participation of more than 20,000 people from nearly 200 countries are going to be held in the backdrop of grim news on climate change from three UN environment bodies.

This meeting is the most important gathering on climate change since the Paris Agreement was signed in 2015.

"It is hard to overstate the urgency of our situation. Even as we witness devastating climate impacts causing havoc across the world, we are still not doing enough, nor moving fast enough, to prevent irreversible and catastrophic climate disruption," Guterres said.

"Nor are we doing enough to capitalize on the enormous social, economic and environmental opportunities of climate action.

"And so, I want to deliver four simple messages."

First: Science demands a significantly more ambitious response, he said.

Second: The Paris Agreement provides the framework for action, so "we must operationalise it".

Third: "We have a collective responsibility to invest in averting global climate chaos, to consolidate the financial commitments made in Paris and to assist the most vulnerable communities and nations."

And fourth: Climate action offers a compelling path to transform our world for the better.

"Let me turn first to science," he said.

According to the World Meteorological Organization, the 20 warmest years on record have been in the past 22 years, with the top four in the past four years.

The concentration of carbon dioxide is the highest it has been in three million years.

Emissions are now growing again.

The recent special report from the Intergovernmental Panel on Climate Change (IPCC) finds that warming could reach 1.5 degrees as soon as 2030, with devastating impacts.

"The latest UN Environment Programme Emissions Gap Report tells us that the current Nationally Determined Contributions under the Paris Agreement will lead to global warming of about three degrees by the end of the century," the Secretary-General said.

He said emissions must decline by 45 per cent from 2010 levels by 2030 and be net zero by 2050.

Renewable energy will need to supply half to two-thirds of the world's primary energy by 2050 with a corresponding reduction in fossil fuels.

"We need to embrace low-carbon, climate-resilient sustainable development."

Ensuring adequate finances to developing nations for sustainable low-emissions, he said: "Some 75 per cent of the infrastructure needed by 2050 still remains to be built."

"Governments and investors need to bet on the green economy, not the grey. That means embracing carbon pricing, eliminating harmful fossil fuel subsidies and investing in clean technologies.

"We also have a collective responsibility to assist the most vulnerable communities and countries -- such as small island nations and the least developed countries -- by supporting adaptation and resilience.

"Making clear progress to mobilise the pledged $100 billion a year will provide a much-needed positive political signal," the UN Secretary General said.

"I have appointed the President of France and the Prime Minister of Jamaica to lead the mobilisation of the international community, both public and private, to reach that target in the context of preparation of the Climate Summit I have convened in September of next year."

"I also urge member states to swiftly implement the replenishment of the Green Climate Fund. It is an investment in a safer, less costly future," he added.

Poland is hosting a COP for the third time. The two previous COPs were held in Pozna (2008) and in Warsaw (2013). Poland also presided over a COP in Bonn in 1999.

The Paris Agreement has been ratified by 184 parties, including India, and entered into force in November 2016.

The commitments contained in it include the annual $100 billion goal from donor nations for lower-income countries and develop national climate plans by 2020, including their self-determined goals and targets.