“Imagine China — the world’s top emitter of carbon, which in 2019 released nearly double the emissions of the US — with almost zero coal power plants.
Imagine it with zero gasoline-powered cars, and with more than four times the 1,200 gigawatts of solar and wind power capacity installed across the world today.
This could become reality by mid-century if China follows through on President Xi Jinping’s latest commitment to addressing the climate emergency.”
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“the target puts China more closely in alignment with the European Union, the UK, and other countries that have committed to carbon neutrality by 2050, which the Intergovernmental Panel on Climate Change said is required to prevent over 1.5 degrees Celsius of warming. In the US, some states and cities have moved in this direction, too. For instance, former governor Jerry Brown signed an executive order in 2018 for California to be carbon neutral by 2045. And Michigan’s governor made the same commitment Wednesday.
Along with the pledge to be carbon neutral by 2060, Xi Jinping also announced that China would submit a stronger set of goals under the Paris agreement and that China would aim to peak carbon emissions before 2030, upping the commitment from “around” 2030.
Meanwhile, in his UNGA remarks, President Trump defended his decision to withdraw the US from the “one-sided” Paris agreement while criticizing China for “rampant pollution.”
Increasingly, China is demonstrating it will use climate as a way to upstage the US, with Xi repeatedly committing to incremental climate action on the international stage in recent years.”
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“Besides the geopolitical motivations, China also has a lot to lose from unmitigated climate change, from catastrophic floods like those this summer in the central Yangtze River Basin to worsening heat waves and sea-level rise, which will have a huge impact on coastal cities like Shanghai by 2050.”
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“China has yet to publish an official plan for how it would achieve carbon neutrality, but climate researchers have mapped out pathways. The good news: Researchers say it is possible. Some of the key shifts are already underway — toward electric vehicles and renewable energy, for example. But China will be entering uncharted territory when it comes to cleaning up its behemoth steel and cement industries.”
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“The next few months will reveal how serious China is about accelerating its decarbonization.”
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“China’s announcement may also have ripple effects on other countries as they choose whether to more aggressively tackle climate change, in the absence of US leadership, approaching the next major UN negotiations on climate change (COP 26), which will be held in November 2021.
“For China, who is experiencing economic ramifications of Covid like every other country, to come out and make this kind of bold statement on carbon neutrality could potentially sway the balance of countries who have been taking a ‘wait and see’ approach to their enhanced ambition climate pledges ahead of COP-26,” Hsu said. Here’s hoping it does.”
“With so many fires burning across a wide region, it’s important to remember that there is a lot of variability in the specific factors at play for a given fire, from the ignition source to what kind of landscape is burning to the local conditions spreading the flames. However, there are some common factors that tie many of these blazes together and make them exceptional.”
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“Record heat this summer baked much of the western United States, with states like California experiencing their hottest August on record. Many cities and counties across the West experienced record or near-record heat throughout the summer and into September. The summer was capped with a punishing heat wave that settled across the region in August and September and drove temperatures well into triple digits.
It has also been extremely dry in California, Oregon, and Washington this summer, with large sections of each state under “severe drought” conditions and some areas reaching “extreme drought.”
That heat and dryness turned grasses, shrubs, and trees into easy tinder, ready to ignite at the slightest spark.”
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“The vast majority of wildfires in the United States are ignited by human sources — power lines, cigarette butts, machinery, or, in the case of one infamous recent fire, a gender reveal stunt. But a strange dry lightning storm near the San Francisco Bay Area in August led to more than 11,000 lightning strikes and triggered more than 300 fires in its wake. The causes of many other fires across the region are still being investigated.
The record-breaking weather comports with what scientists expect as the climate changes, and in many of the burning areas, the climate has already shifted in ways to worsen fire risk.”
“Kaufman and his co-authors propose an alternative design framework for a carbon tax: a near-term to net zero (NT2NZ) approach.
In a nutshell, rather than asking what the optimal carbon price is in some econo-metaphysical sense, the approach begins by asking: Given other policies in place and a reasonable set of assumptions, what price on carbon is required to drive emissions to net zero on schedule?”
“even as attention has shifted to climate change, the air pollution case has grown stronger and stronger, as the science on air pollution has advanced by leaps and bounds. Researchers are now much more able to pinpoint air pollution’s direct and indirect effects, and the news has been uniformly bad.”
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“the effects of air pollution are roughly twice as bad as previously estimated.”
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“Right now, air pollution leads to almost 250,000 premature deaths a year in the US. Within a decade, aggressive decarbonization could reduce that toll by 40 percent; over 20 years, it could save around 1.4 million American lives that would otherwise be lost to air quality.”
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“With giant data sets, “you can control for socioeconomic status, temperature, hypertension and other existing conditions,” and other variables, says Shindell. “You can convincingly demonstrate that correlation is in fact causal, because you can rule out essentially every other possibility.””
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““The well-understood pathways, things like strokes, lower respiratory infections, and chronic obstructive pulmonary disease, only seem to capture about half the total,” Shindell says. “When you look at the [new] studies, you find that air pollution seems to affect almost every organ in the human body.””
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“It is no coincidence that Trump’s Environmental Protection Agency is trying to exclude consideration of co-benefits (often the largest class of benefits) in its air quality rulemakings. It’s no coincidence that it is trying to exclude consideration of studies with anonymous participants, a category that encompasses all the latest research Shindell and others draw on. The fossil fuel lobby, which now includes the entire executive branch, has long understood that the science isn’t going its way. These rule changes are its last-ditch bid to blind the government to new research.”
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“It is true that climate change can only be averted with the entire world’s cooperation; if the US reduces its emissions to net zero but the other countries of the world (especially China and India) continue on their current trajectory, it will make almost no difference in temperature. The health benefits of avoided severe heat will not manifest.
However — and this is the crucial fact — the air quality benefits will manifest, no matter what the rest of the world does. Shindell’s team ran a version of their scenario in which the US came into compliance with a 2°C pathway but the rest of the world continued with current policies. “We found that US action alone would bring us more than two-thirds of the health benefits of worldwide action over the next 15 years,” Shindell testified, “with roughly half the total over the entire 50-year period analyzed.”
The air quality benefits arrive much sooner than the climate benefits. They are, at least for the next several decades, much larger. They can be secured without the cooperation of other countries. And, by generating an average of $700 billion a year in avoided health and labor costs, they will more than pay for the energy transition on their own. Climate change or no climate change, it’s worth ditching fossil fuels.”
“A team of 25 scientists from around the world recently took a stab at answering the question of how sensitive the Earth’s climate is to carbon dioxide and came up with range of possibilities. Their results, published July 22 in Reviews of Geophysics, showed that the planet would most likely warm on average between 4.7 degrees Fahrenheit and 7 degrees Fahrenheit (2.6 degrees Celsius and 3.9 degrees Celsius) if atmospheric carbon dioxide were to double.
This is still a wide span, but it’s much smaller than prior estimated range of 2.7 and 9.1 degrees Fahrenheit (1.5 and 4.5 degrees Celsius) that had been the reigning benchmark for decades.
The new, narrower estimate for climate sensitivity has huge implications, not just for climate science, but for how humanity prepares for a warming world. It shows that the worst-case-scenario is not as dire as previously thought, but also that the best possibilities are still quite grim. In particular, it means that it will be almost impossible to hit the main target of the Paris climate agreement, limiting warming to less than 2 degrees Celsius (3.6 degrees Fahrenheit) this century, by chance; it will require aggressive action to reduce emissions with even less margin for delay.”
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“The resulting estimate of climate sensitivity — 4.7 degrees to 7 degrees Fahrenheit (2.6 degrees Celsius and 3.9 degrees Celsius) — may seem small, but it represents a drastic shift from the world as we know it today. In an editorial in the Hill, Hausfather pointed out that during the last ice age 20,000 years ago, the planet was on average 9 degrees Fahrenheit (5 degrees Celsius) cooler than today. That led to so much ice across the planet that global sea levels were 300 feet lower than they are today.”
“A heat wave begins with high atmospheric pressure building up over an area. A downward-moving air column compresses the air that’s closer to the ground, holding it still and heating it up. That high pressure also forces clouds away and around the column, creating an unobstructed line of light between the ground and the sun.
Over a period of days and weeks, the ground absorbs sunlight, and with stagnant air, heat accumulates and temperatures rise. “There’s nothing coming in and nothing going out,” explained Walt Meier, a senior research scientist at the National Snow and Ice Data Center at the University of Colorado Boulder. “It’s kind of like an oven basically.”
That’s the general formula for heat waves around the world. But there are also several unique ingredients contributing to the Arctic one.
In northern latitudes during the summer, there is near-continuous sunlight — even at night. That allows heat to accumulate faster than in areas that experience sunsets and can cool off in the evening.
Another factor this year was the lack of snow. With an unusually warm winter, less snow built up across parts of the Arctic, and with a warm spring, much of it melted away sooner than usual. “The snow is very reflective of the sunlight,” said Meier. “This year, the snow went away earlier, so then you have the bare ground that can absorb more solar energy.”
The warmer ground also dries out in the heat. With less moisture, there is less evaporation that can cool the surrounding air. “The drier ground and the air over the top of it makes it more susceptible to rapid warming when you have the right conditions like we’re seeing now,” Meier said.”
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“One of the overarching trends behind the heat wave and the wildfires is climate change. Earth as a whole is warming up due to human emissions of greenhouse gases like carbon dioxide. But every place isn’t warming up at the same rate; the Arctic is warming at double the rate of the rest of the planet, which is why some of the earliest effects of climate change are felt in the region. The north pole also presents a window into the future for the rest of the world.
Those higher average temperatures mean extreme heat will become even more likely and more intense, exacerbating threats like forest fires as vegetation dries out. “The wildfires definitely come from the extreme heat and the dryness,” Meier said.
The loss of these ancient, slow-growing forests will release carbon dioxide into the atmosphere that will take decades to reabsorb, further warming the planet. Warming in the Arctic is also thawing permafrost, which releases even more carbon into the atmosphere.
And while it’s summer in the Arctic right now, the region has also experienced heat waves in the winter. In fact, researchers have found that in general, winters are warming faster than summers. That’s part of the reason why the Arctic is now losing sea ice at its fastest rate in 1,500 years.”
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“Antarctica is also warming up. Earlier this year, the continent broke two high-temperature records within a week.”
“The US does not actually have a national grid. Our grid is instead split into three regions — the western interconnection, the eastern interconnection, and, uh, Texas — that largely operate independently and exchange very little power.”
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“this is a barrier preventing all sorts of efficiencies.”
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“87 percent of the nation’s total wind energy potential and 56 percent of its utility-scale solar potential, but are only projected to account for 30 percent of the nation’s energy demand in 2050.”
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“The way to balance this out — to make sure that every region is producing as much renewable energy as possible and that the energy is put to good use — is to connect these regions with high-voltage transmission lines. The more each region can import and export electricity, the more it can balance its own fluctuations in supply and demand with its neighbors’ and maximize the use of renewable energy.”
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“Clack and his co-authors also found that weaving the regionally divided power system into a single national system would save consumers around $47.2 billion a year through increased efficiency and cheaper renewable energy.”
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“The best way to build resiliency against these events, which are increasing in frequency due to climate change, is to connect the regions of the country into a single national grid, so that regions facing difficulty can draw power from neighbors who aren’t.”
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“investment into a national grid would create thousands of construction and maintenance jobs.”
“A small town in Siberia reached a temperature of 100.4 degrees Fahrenheit on Saturday, which, if verified, would mark the hottest temperature ever recorded north of the Arctic Circle.
Temperatures have jumped in recent months to levels rarely seen in the Russian region, and it’s a sign of a broader trend of human-caused climate change that’s transforming weather patterns in the Arctic Circle.
The town of Verkhoyansk is one of the coldest towns on Earth — temperatures dropped to nearly 60 degrees below zero there this past November — and the average June high temperature is 68 degrees.
The 100.4 reading in Verkhoyansk, which sits farther north than Fairbanks, Alaska, would be the northernmost 100-degree reading ever observed.”