A major UN report has issued a warning on the climate impacts of relying on fossil fuels.

• The latest report from the IPCC assesses the effects of the climate crisis on both the natural environment and human populations globally.
• At a time when there are concerns that Russia's invasion of Ukraine may divert policymakers from taking coordinated action, the gold standard summation of modern climate science is provided to world leaders.
• U.N. Secretary-General António Guterres stated on Monday that the global economy and energy security are at risk due to our dependence on fossil fuels, as demonstrated by current events.

On Monday, leading climate scientists warned that climate change, caused by humans, is causing significant disruptions in nature, with the most vulnerable people and ecosystems being the hardest hit.

The U.N.'s Intergovernmental Panel on Climate Change, with the approval of 195 member states, has made it clear that incremental changes are insufficient to address the climate emergency.

At a time when there are concerns that Russia's invasion of Ukraine may divert policymakers from taking coordinated action, the analysis offers a comprehensive summary of modern climate science to world leaders.

The world will inevitably experience climate risks in the upcoming two decades due to the global temperature increase of 1.5 degrees Celsius above the pre-industrial levels, which is the ambitious goal set in the 2015 Paris Agreement.

The report warns that exceeding the critical threshold, even temporarily, would result in severe impacts and there are significant gaps between ongoing adaptation efforts and the necessary actions to address the growing risks.

The second of three major reports from the IPCC, released since November's COP26 summit in Glasgow, Scotland, examines the impacts of the climate emergency on nature and people worldwide.

I have witnessed numerous scientific reports throughout my tenure, but nothing compares to this one," said U.N. Secretary-General António Guterres on Monday. Earlier, he characterized the IPCC's August report as a "code red for humanity.

"Our dependence on fossil fuels puts the global economy and energy security at risk of geopolitical shocks and crises. We must speed up the transition to renewable energy instead of slowing it down," he stated.

Guterres stated that the report highlights two fundamental truths: firstly, that coal and other fossil fuels are causing harm to humanity, and secondly, there is slightly better news in the form of investments in adaptation work.

The IPCC's report revealed that extreme weather events and gradual changes, including rising sea levels, were negatively impacting individuals' health, lives, and livelihoods.

In the past 12 months, the world has experienced unprecedented natural disasters, including record-breaking heatwaves and wildfires in North America, devastating flooding events in Europe and China, a severe drought-induced hunger crisis in the Horn of Africa, and unprecedented changes in the polar regions.

John Kerry, the U.S. Special Presidential Envoy for Climate, stated that the IPCC's report presents a grim outlook on the consequences of a warmer planet, emphasizing the urgent need to address climate change.

What does the report say?

The analysis confirms that the climate crisis is already affecting humanity with 1.1 degrees Celsius of warming and highlights the global injustice of climate-related disasters.

The rising occurrence of heatwaves, droughts, and floods is beyond the tolerance of plants and animals, resulting in mass deaths among species such as trees and corals.

The IPCC chair, Hoesung Lee, stated in a report that climate change is a severe threat to our wellbeing and the planet, and our actions now will determine how people adapt and nature responds to the increasing climate risks.

The report states that simultaneous extreme weather events are causing cascading impacts that are becoming increasingly difficult to manage, resulting in acute food and water insecurity for millions of people, particularly in Africa, Asia, Central and South America, small island states, and the Arctic.

The report advises that to prevent the loss of life, biodiversity, and infrastructure, urgent action must be taken to adapt to the climate crisis, along with immediate and significant reductions in greenhouse gas emissions.

The primary cause of the climate crisis is the burning of fossil fuels, including coal, oil, and gas.

Fossil fuels are a "dead end" for the planet, humanity, and economies, according to the U.N.'s Guterres. He holds those in the private sector who finance coal accountable, while oil and gas giants and their underwriters are also on notice.

"The only way to achieve energy security, universal access, and green jobs is through a smooth and well-planned transition to renewable energy sources," he stated.

According to IPCC Working Group II co-chair Hans-Otto Pörtner, ecosystems that are in good health are better able to withstand the effects of climate change and offer essential services such as food and clean water.

Restoring degraded ecosystems and conserving 30 to 50 percent of Earth's land, freshwater, and ocean habitats can benefit society by utilizing nature's ability to absorb and store carbon, thereby accelerating progress towards sustainable development. However, adequate finance and political support are necessary.

Climate finance is viewed as a matter of climate justice, with high-income countries expected to financially assist low-income nations in addressing the climate crisis.

Although a commitment by wealthier countries to provide low-income nations with $100 billion a year in climate finance by 2020 was a key element of the Paris accord, this pledge is not expected to be met until 2023.

The IPCC's latest report states that the current financing for climate adaptation is insufficient, and even more funding will be required in the future as global temperatures continue to rise.

Tina Stege, the climate envoy for the Republic of the Marshall Islands, stated that failing to adapt to the crisis, not providing fair and accessible climate finance, and continuing to depend on fossil fuels will all result in the loss of lives.

Once more, the repercussions of inaction have been made plain, so not acting is inhumane and unconscionable.

Guterres stated that increasing investments in adaptation is crucial for survival, as the COP26 commitment on adaptation funding is insufficient to address the challenges faced by countries impacted by climate change.

Guterres urged that 50% of the total climate finance be allocated to resilience and adapting to the impacts of global warming.

The climate emergency is linked to global trends, including unsustainable resource use, urbanization, social inequalities, and extreme event damages, which pose a threat to future development, according to climate scientists.

According to IPCC's Pörtner, the scientific evidence is clear: any delay in global action will miss the opportunity to secure a livable future.

What are the reasons for cautious optimism?

Although the report presents a grim outlook, it also suggests that some of the worst-case scenarios can be avoided if swift and bold action is taken to address the deepening crisis.

The report states that by investing in protecting nature and rebuilding ecosystems, we can lower the risks of climate change to people and benefit both humans and biodiversity.

By implementing measures such as restoring wetlands and natural habitats, cities can reduce flood risk, cool down through parks and ponds, and green streets. Farmers can also increase their businesses' resilience by diversifying their crops and livestock.

The report emphasizes that while relying on nature alone is not sufficient, drastically reducing human-induced greenhouse gas emissions and taking actions to transform our way of life are necessary to achieve sustainable development and increase climate resilience.

Emily Shuckburgh, director of Cambridge Zero, emphasized at a media briefing that climate change is both predictable and preventable, making it a crucial issue to recognize.

If there is good news, it is that solutions exist, according to Shuckburgh. If implemented thoughtfully, it could have multiple benefits, and the reverse of cascading risks is that you have cascading opportunities.

Michael Marmot, a professor of epidemiology at University College London, stated during a briefing that he does not view the necessary changes to achieve a fairer and healthier plant as negative.

Grasping the opportunity to create a healthier planet and a fairer society is something we should be grateful for, according to Marmot.

The IPCC conducts comprehensive reviews of recent climate research every few years, with its sixth assessment cycle beginning in 1990 and resulting in the publication of its first major report.

The IPCC's Sixth Assessment Report, published in August, emphasized the physical science of climate change. It showed that achieving a global temperature increase of 1.5 degrees Celsius would be impossible without immediate and significant reductions in greenhouse gas emissions.

The IPCC's third report in its sixth assessment cycle will focus on climate mitigation and reducing greenhouse gas emissions and removal from the atmosphere, and is set to be published in early April.

The Synthesis Report, which integrates the findings of the three previous IPCC assessments, is set to be released in September as the final part of the Sixth Assessment Report cycle.