Climate change IPCC report is 'code red for humanity', UN scientists say – BBC News
Environmental experts have called it a massive wake up call to governments to cut emissions. 234 authors from 66 countries have worked on the landmark assessment. The report says global average temperature rise could reach or exceed 1.5 degrees celsius in the next 20 years. Now that is 10 years sooner than expected, that temperature rise will breach the ambition of the 2015 paris climate agreement and bring widespread devastation and unprecedented extreme weather. This all comes less than three months before the cop 26 climate conference in glasgow in scotland, vital un talks that will determine the future course of efforts to tackle climate change, and the uk minister responsible for delivering cop 26 has released this statement following the publication of Todays report, he says our message to every country, government, business and part of society is simple. The next decade is decisive, follow the science and embrace your responsibility to keep the goal of 1.5 degrees celsius alive. Our environment and energy. Analyst, roger harebin has more wildfires blazing through greece, and turkey have horrified people in the region. The panel concludes well see a lot more fires, as temperatures continue to rise and rise, they will, as greenhouse gas emissions, keep growing and growing. The increased heat will change. Weather patterns, bringing more droughts and more rainfall, researchers say london was shocked to find areas underwater a few weeks ago. Rainfall patterns are hard to predict, but experts say northern europe will be wetter overall at londons hampstead ponds theyve already had to raise and reinforce the dams.

To protect hundreds of homes downstream from the sort of floods expected in extreme rains that are forecast to come, the cost has been huge were already paying the price of ignoring scientists warnings on climate change. So this report states as an absolute fact that human influence is warming, the climate and thats, a very stark reminder that it is our activities which are changing the climate and affecting these extreme weather events and as the planet continues to warm. These consequences just get worse. Ice in the arctic is melting faster than many scientists predicted that leads to sea level rise, which in turn increases coastal flooding. The seas will keep rising for maybe thousands of years, because the ocean deep, has absorbed so much heat already. Political attitudes are changing, the uk is getting electric cars, we need clean technology for home heating too, in the words of one leading scientist were not doomed, but if we want to avoid catastrophe, we have to drastically cut emissions now roger harriban, bbc news valerie masson delmot, Is a climate scientist and co chair of one of the ipcc working groups which produced the climate change report? She said the threshold of keeping the global temperature at 1.5 degrees celsius limit will be breached around 2050.. The report shows that in the next 20 years, global warming, the average temperature at the earths surface over a period of 20 years, is expected to reach or exceed 1.5 degrees celsius above the late 1800s.

However, if we rapidly reduce greenhouse gas emissions, if we can reach global net zero co2 emissions around 2050, it is extremely likely that we can keep global warming well below 2 degrees. If we do this, it is more likely than not that temperature would gradually decline to below or around 1.5 degrees celsius by the end of the century, with a temporary overshoot of no more than degrees celsius. But if global greenhouse gas emissions remain around todays levels in the coming decades, we would reach 2 degrees of global warming by the middle of this century were joined now by tamzin edwards, a climate scientist and one of the authors of this report welcome to bbc news. I know your area of expertise is the oceans and sea level change and in fact, youve spent three years uh investigating this havent havent you. So it would be remiss of me not to find out more about that. What did you find exactly well, thats right? We have over 200 authors um in the whole report. We have looked at 14 000 scientific studies over three years and i work on ice sheets and sea level rise. As you say, we dont do new research. We assess the robustness of the evidence so, for example, for the antarctic ice sheet, we looked at the range of possibilities of the future of the ice sheet and therefore its contribution to sea level rose, and one of your findings is that the melting of greenland glaciers Is irreversible? Am i right well thats right, so there are different parts of um.

There are different uh ice regions around the world. We have the glaciers of the mountains and the polar regions and we have the great ice sheets of greenland and antarctica. The mountain and polar glaciers are particularly sensitive, and we have already committed to further melting over the next decades. To hundreds of years were also going to see more ice loss from the greenland ice sheet over the next century over this century and for the antarctic ice sheet, theres a really wide range of possibilities. If we limit greenhouse gas emissions, we may be fortunate and have a relatively low contribution to sea level rise. But if we have very high greenhouse gas emissions and were unlucky with how sensitive that ice sheet is, we could see very high sea level rise. Indeed. So, my right that the message is theres no going back from some change once theyve melted, they cant be re frozen. I assume, but there is a cautious optimism that this could be slowed, or indeed even halted, or is that putting it too optimistically? We think that the the mountain and polio, the mountain and polar glaciers are these smaller glaciers and also arctic sea ice could have some reversible changes. So if we limit warming and eventually reduce uh temperatures, further that those could regrow and and restore to some degree, the ice sheets are much slower to respond. So greenland and antarctica will keep responding for hundreds, if not thousands of years and combined with the warming of the ocean, which makes it expand and contribute to sea level rise.

That means sea levels are going to remain elevated for thousands of years. I was very struck by what inga anderson said: the executive director of the un environment program uh. She said scientists have been telling us for over three decades of the dangers of allowing the planet to warm. The world listened, but did not hear, and i wondered, do you think government and people will its a difference isnt it between taking any notice of this and doing something about it. Of course i mean speaking personally, you know i i do sense, a real shift in the in the conversation over the last few years, but i think what this um ipcc assessment report shows its much more comprehensive than ever before, assessed more of the scientific evidence than Ever before, obviously, the timing with respect to the cop 26 meeting later this year, it really shows that if we do have immediate rapid and large scale reductions in greenhouse gas emissions, we can still limit warming to one and a half degrees above the sort of late 1800S, as weve heard, without much overshoot and eventually go to lower warming again. But if we dont um enact the policies and pledges that we already have in place and in fact, if we dont make those stronger, then we wont meet that target. But what are your conclusions about reducing those greenhouse gas emissions and keeping temperatures to 1.5 degrees celsius above pre industrial levels? Can it can it be done? Well? This particular part of the ipcc report is called the working group.

One report, which is around the science of climate change, and so we looked at different scenarios of emissions and what that would mean for climate change. What we need to look out for next year is the third working group which looks at mitigation. In other words, where are those emissions coming from what are the different pathways to cutting those emissions? So that will give much more of that detail about exactly the how of cutting emissions, whereas what this report is doing is showing the implications of very low emissions or medium intermediate emissions or very high.

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