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Climate scientists say Greta Thunberg's efforts are building real momentum

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Youth Climate activist Greta Thunberg speaks during the UN Climate Action Summit at the United Nations Headquarters in New York on Sept. 23, 2019. -
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Ludovic Marin AFP - Getty Images
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Environmental activist Greta Thunberg's searing address at the United Nations earlier this week earned enthusiastic praise from climate researchers, with many saying that the 16-year-old has found ways to raise awareness of climate science, galvanize support and resonate with people in ways that they have struggled to for decades."Speaking as a climate change scientist who has been working on this issue for 20 years and saying the same thing for 20 years, she is getting people to listen, which we have failed to do," said Saleemul Huq, director of the International Centre for Climate Change & Development in London."I thought it was the most powerful speech I've ever seen."Sally Benson, co-director of the Precourt Institute for Energy at Stanford University, applauded Thunberg's emotional remarks and her efforts to mobilize young people to demand action on climate change."She has been a catalytic leader," Benson said. "We're seeing more grassroots action, and she's creating a movement where young people are pushing communities, cities, states and corporations and saying, 'we're not going to wait.'"

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Thunberg's impassioned statement at the U.N.chided world leaders for not doing enough to address climate change and emphasized the urgency of the global situation, referring often to figures from a seminal report released by the Intergovernmental Panel on Climate Change in October 2018 on the impact of 1.5 degrees Celsius of global warming.The report stated that the planet has already warmed by 1 degree Celsius since the 19th century, and used 1.5 degrees as a threshold beyond which the effects of climate change, such as melting ice, extreme heat and sea-level rise, become life-threatening for tens of millions of people around the world.

Youth Climate activist Greta Thunberg speaks during the UN Climate Action Summit at the United Nations Headquarters in New York on Sept. 23, 2019.
Youth Climate activist Greta Thunberg speaks during the UN Climate Action Summit at the United Nations Headquarters in New York on Sept. 23, 2019.Ludovic Marin

"The popular idea of cutting our emissions in half in 10 years only gives us a 50 percent chance of staying below 1.5 degrees and the risk of setting off irreversible chain reactions beyond human control," Thunberg said.But even the possibility of reducing global carbon dioxide (CO2) emissions so drastically by 2030 is fast becoming impractical, according to Simon Donner, a climatologist at the University of British Columbia in Vancouver, Canada."Mathematically and technically, it is possible, but it's not realistic," Donner said. "To reduce emissions that sharply in what is now only a 10-year period would take enormous changes in countries around the world."Science

Recent trends have demonstrated how challenging it is to even keep carbon emissions level. A report released last year by the Global Carbon Project, formed by an international consortium of climate researchers, stated that global carbon emissions hit a record high in 2018. After a period of stability from 2014 to 2016, global greenhouse gas emissions rose in 2017 and then jumped another 2.7 percent in 2018 to an all-time high of more than 37 billion metric tons."The trend is very bad if we want to stay within the 1.5-degree window," said Michael Mehling, deputy director of the Center for Energy and Environmental Policy Research at the Massachusetts Institute of Technology.At current emissions levels, the so-called CO2 budget — which calculates how much more carbon dioxide can be released into the atmosphere while limiting warming to below 1.5 degrees Celsius — will likely be used up in about eight years, according to Mehling, a fact echoed by Thunberg in her speech to the U.N.But even if some of these challenges seem insurmountable, Donner said it's important for people to not feel disheartened, because incremental changes can make a big difference."The real message of the IPCC report last year is that every action counts," he said. "The world is not going to end in 2030, even if we fail to avoid 1.5 degrees of warming. But we should still do the best we can, because the more we reduce emissions, the less the planet will warm and the less people will suffer."Nathan Hultman, director of the Center for Global Sustainability at the University of Maryland, said Thunberg's U.N. address was particularly effective at conveying the need for urgent action."I like that it ruffled feathers," said Hultman, who worked at the White House on climate and energy policy for the Obama administration from 2014 to 2016. "The statement she made is not the normal kind of statements you hear at U.N. summits. We need to cut through the chummy approaches that happen at the international level and speak truthfully about what we need to do."He added that Thunberg's speech and the climate strike movement that the Swedish teen started in 2018, which on Sept. 20 drew millions to the streets for a "Global Climate Strike," has sparked what he thinks is real progress on the issue."I don't think we're grasping at straws — I think we're seeing some real signs of movement, and that gives me hope," Hultman said. "We've been crossing this bridge for decades and now we're partially over it, but there's a lot more bridge to go."Sign up for the MACH newsletter and follow NBC News MACH on Twitter and Facebook and Instagram.