The world has warmed more than one degree Celsius since the Industrial Revolution. The Paris climate agreement hoped to restrict warming to two degrees. The     1     of succeeding, according to a recent study based on current emissions trends, are one in 20. If by some miracle we are able to limit warming to two degrees, we will only have to negotiate the extinction of the world’s tropical reefs,     2     the sea-level rise of several meters and abandon the Persian Gulf. The climate scientist James Hansen has called two-degree warming “long-term disaster”, which is now the best-case scenario. Four-degree warming will mean “short-term disaster”: Europe in permanent drought; vast areas of China, India and Bangladesh claimed by desert; the American Southwest largely     3    .

In the decade that ran from 1979 to 1989, we had an excellent opportunity to solve the climate crisis. The world’s major powers came within several signatures of     4     a global framework to reduce carbon emissions — far closer than we’ve come since. During those years, the conditions for success could not have been more     5    . The obstacles we blame for our current inaction had yet to emerge. Almost nothing stood in our way — nothing except ourselves.

Nearly everything we understand now about global warming was understood in 1979. Human beings have altered Earth’s atmosphere through the     6     burning of fossil fuels. At the start of the 1980s, scientists within the federal government predicted that     7     evidence of warming would appear on the global temperature record by the end of the decade, at which point it would be too late to avoid disaster. A report prepared by the National Academy of Sciences advised that “the carbon-dioxide issue should appear on the international     8     in a context that will maximize cooperation and minimize political controversy and division.” If the world had adopted the proposal widely supported at the end of the ‘80s, warming could have been held to less than 1.5degrees.

But they failed, even though the world’s leading oceanographer Henry Stommel and the Harvard planetary physicist Richard Goody, whose mere presence could inspire     9    , tried to warn humanity of what was coming. They risked their careers in a painful campaign to solve the problem, first in scientific reports, later through     10     avenues of political persuasion and finally with a strategy of public shaming. Their efforts were passionate and they failed. Now it is our turn.

3 . If you look at the dynamic “Global Temperatures” map on NASA’s website, you can see the historic temperature change over time across the planet as the timeline goes from 1880 to the modern day. By 2019, the entire planet is in red, orange, and yellow colors, indicating temperatures much higher than the historical average in every country and human inhabitance.

If the timeline went to 2023, the map would look even worse. That’s because the summer of 2023 was the hottest ever, according to ocean monitors. July was the hottest month in recorded history. Next July could be worse. Unless we do something quickly, we face dealing with more and more dangerous and expensive natural disasters in the future.

Forest fires sent smoke from Canada across the North American continent, causing New York City to have the worst air quality in its recorded history. Heavy rainstorms fell on Vermont and the Northeastern United States in just a couple of days in the middle of July, which exceeded the amount that area would usually receive in two months and caused extreme damage to homes and businesses. Around the same time, flash flooding in Bucks County, Pennsylvania — north of Philadelphia — killed nearly a dozen people.

Erich Fischer, a researcher specializing in climate studies at the Swiss Federal Institute of Technology, is concerned that natural disasters could get much worse in the future—and in ways we cannot predict. He called for a “strike for climate justice,” which actually took place on Sept. 15, 2023. “The strategy needs to be twofold (双重的) . We need to decrease carbon emissions as much as realistically possible. That is already happening with people using electric cars and other green technologies. At the same time, we also need to find ways to predict the risk of natural disasters ahead of time,” said Erich Fischer.

5 . More than one-third of the world’s food is wasted or thrown away, most of which ends up in landfills, producing very large amounts of planet-warming greenhouse gases. Now, many studies show that it is becoming harder to grow enough food to feed an increasing population due to climate change and soil degradation.

But one of the most promising and simplest solutions lies in the problem itself: this wasted food — if composted (堆肥) — could slow climate change and improve soil quality. Higher-quality soil also continues to absorb more carbon from the atmosphere, helping to improve plants and contributing further to fighting climate change. Returning one ton of organic matter to each hectare of soil would increase the production of cereal crops each year in Africa, Asia and South America by millions of tons.

While it is true that people can compost in their yards, community gardens, or even on their kitchen counters, larger-scale efforts, including infrastructure (基础设施) and incentives (激励) for consumers, would take it to the next level. Imagine if consumers could just leave unwanted food in a roadside bin for pickup, or drop it off at a local store, earning a few cents a bucket, just like what has been offered for recycling bottles or newspapers.

Moreover, in the case of composting, the payment incentive system would be sustainable because the end-product of compost can be sold to farmers, making it an economically workable model, something that is often lacking in recycling, especially for certain materials, like many types of plastics.

Eventually, more widespread composting of food would pave the way for solutions to additional waste challenges, such as the disposal of packaging and clothing. This will have other positive effects as well; if more consumers compost, companies will be more inspired to make and use compostable packaging, clothing, and other products. While more compostable items are starting to emerge today, additional composting will further drive demand and innovation, and offer a game-changing solution for the planet.

From a distance, the grey cement bridge looks unremarkable. Two tunnels on either side of the Trans-Canada Highway are in semi-circles that end bluntly on the pavement below. But on top, away from passing motorists’ eyes, lies a grassy oasis. Against the odds, pine trees and wildflowers have taken root here, giving the overpass a fringe of greenery. On the edges, wire fencing provides safe passage for wandering animals.

Tony Clevenger has dedicated much of his life to studying the performance of Banff’s wildlife crossing structures. When the first wildlife bridges went up, Clevenger, a researcher with the Western Transportation Institute, was living in Canmore, and recalls the distinctly negative atmosphere that surrounded what many saw as a hair-brained scheme by Parks Canada. Save for a few small crossings in the eastern United States, no one had ever attempted something like this before — and no one believed it would work. Editorials in the local paper scoffed at the “waste of taxpayers’ money” and confidently stated animals would never use the $2 million to $3 million man-made bridges. Others believed wolves would herd their prey into the fence, violently killing them before shocked tourists. 

“This project started in a bad spot. There was a lot of opposition and criticism,” Clevenger says. “It took several years of good data, publishing in scientific peer-reviewed journals, to change people’s minds.” 

Clevenger now has 17 years-worth of data proving the efficacy of the crossings. Among large carnivores, mortality (死亡) rates are 50 to 100 per cent lower along sections of the highway where overpasses and underpasses exist. In those same sections, mortality rates for elk are almost zero, compared to 100 elk-vehicle collisions per year in the mid-1990s. Clevenger’s research has shown that 11 species of large mammals in Banff have used the structures more than 200,000 times, including unexpected species such as red fox, hoary marmot, boreal toads, wolverines, lynx, garter snakes and beavers. 

In 2014, a Montana State University study found that not only are grizzly bears using the crossing structures, but the structures are also helping to maintain genetically healthy populations among the bears that use them. Grizzlies were crossing with enough frequency to ensure populations on either side of the highway weren’t genetically isolated from each other. 

“This is Canada’s biggest conservation success story — it’s the largest highway mitigation complex in the world,” says Clevenger. “You won’t find anything anywhere else in the world close to what we have. We have the most overpasses in one localized area and almost half of all the overpasses in North America.”

9 . Bumblebees are vanishing at a rate consistent with widespread extinction, and climate change is playing a big role. The analysis comes from a new study published in the journal Science today.

The authors found that the likelihood of a bumblebee population surviving in any given place within North America and Europe has dropped by an average of 30 percent as temperatures have risen.

Pesticides, habitat loss, and pathogens(病原体) have already hit bumblebee populations hard. The new study, however, is able to isolate the effect that hotter temperatures are having on bumblebees. Sadly, bees are having a hard time adapting to a warming world. “If things continue along the path without any change, then we can really quickly start to see a lot of these species being lost forever,” lead author of the study Peter Soroye tells The Verge.

That’s not just a tragedy for the bees. It’s also bad news for all the plants that they pollinate and for humans who eat the fruits (and vegetables) of their labor. “We also lose out on a lot of color on our plates,” Soroye says. “Tomatoes, squash, and berries are just some of the crops we can thank bees for pollinating. Animal pollinators like bees, birds, and butterflies could be responsible for up to 1 out of every 3 bites of food we eat,” the US Department of Agriculture says.

For this study, Soroye and colleagues examined data from 1900 to 2015 on 66 species of bumblebees across North America and Europe. They mapped the places bees called home and how their distribution changed over time. They found that bees were vanishing in the areas that had heated up beyond the limit in which the bumblebees had historically been able to survive.

Some bee populations are colonizing new territories that were previously too cold. But those gains are overshadowed by losses in areas where the bees once thrived but are now too hot.