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Human Civilization Is Under Threat. We Must Save Nature to Save Ourselves

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Human Civilization Is Under Threat. We Must Save Nature to Save Ourselves
Birds scavenging the waste at Robinson Deep landfill, Johannesburg's largest landfill. Gulshan Khan / AFP / Getty Images

By Susan Casey-Lefkowitz

This is a rough moment to read or listen to environmental news. As we're experiencing a seemingly unending parade of rollbacks and pro-polluter actions coming out of DC, the international science community is ringing the alarm bell on a series of issues that need attention — now. Most notably, last year's IPCC climate report made clear that action needs to happen fast if we are going to stave off the worst impacts of climate change.


That report was scary. Now there's a new scientific assessment of global ecosystems on the verge of collapse — and it's downright horrific.

The United Nations' Global Assessment Report on Biodiversity and Ecosystem Services reflects the scientific expertise of 150 biodiversity experts from 50 countries on behalf of the Intergovernmental Science – Policy Platform on Biodiversity and Ecosystem Services (IPBES). The report is organized around four key messages:

  • Nature underpins and sustains quality of life, but its contributions to people are deteriorating worldwide.
  • The issues and practices pushing us toward natural collapse have accelerated during the past 50 years. For example, over the past 30 years, global trade has increased eightfold.
  • Short-term goals for protecting nature and achieving sustainability cannot be met by current trajectories, but goals for 2030, 2050 and beyond can be achieved through transformative change, which means a fundamental, system-wide reorganization across technological, economic and social factors, including paradigms, goals and values.
  • Nature can be conserved, restored and used sustainably while simultaneously meeting other global societal goals through proven solutions and transformative change.

In short, the report says we need to protect nature — or nature is going to stop protecting us in some very frightening ways: disappearance of species we care about and rely on, like pollinators and freshwater fish; decline in agricultural yields due to severely damaged soil; eradication of forest ecosystems, along with all the carbon storage and wildlife home benefits they bring; and elimination of freshwater streams that provide drinking water for our survival.

As this report makes clear, our international framework for protecting nature is not enough: "The negative trends in nature and its contributions to people are projected to continue to 2050 and beyond in all scenarios except those that include transformative change, due to the projected impact of increasing land-use change, exploitation of organisms, and climate change."

It is hard not to read the assessment and just curl up in a ball. Like climate change, these issues seem huge.

But the reality is that there are solutions. And many are not new. This report just makes it more urgent for us to do things that we have known were needed for quite some time and push the envelope on some new ideas.

Taking the steps necessary to reverse the degradation of our natural world will not be easy, but there is a clear path. We must prioritize nature for itself and as the system that nurtures us and our children into future generations. We must set aside vast areas of land, waters and ocean from industrial development; we must adopt new laws and invent new mechanisms that elevate the needs of nature; and we must be bold in using existing tools to maximize protections for nature.

Protect vast areas of land and ocean.

We must expand the current network of land-based protected areas and marine protected areas, particularly in the context of climate change. Earlier this year, NRDC joined some of the world's biggest and most respected conservation groups to call for 30 percent of the world's lands and oceans to be made protected areas by 2030. And we need to stop doing wasteful things like chopping down the boreal forest in Canada for toilet paper, or the great forests of the American Southeast for exported wood pellets dirtying up the energy sector in other countries while worsening the environment in our own. The report makes clear these sorts of actions are even more necessary than we thought.

Sustainably feed the world.

We must do a better job at land-use planning and managing crop and livestock production and consumption. We must implement ecosystem-based fisheries management and spatial planning — including the expansion of marine protected areas — in a manner that addresses ocean stress from climate change, pollution and acidification. We also need to get far more serious about restorative agricultural practices that address the health of soils that our farms are utterly reliant upon.

Safeguard freshwater.

To maintain adequate access to clean, fresh water, which is suffering from climate change, pollution and demand, we must improve efficiency, increase storage capacity, improve water quality and minimize the disruption of our natural water systems. We need to ensure that existing wetlands and source waters are protected by strong national laws, minimize pollution and nutrient flows into our waters by farming in ways that protect soil and minimize fertilizer use, and ensure that our rivers have enough water flowing through them to maintain healthy fish and wildlife populations.

Disrupt current patterns of consumption and waste.

Simply put, we must reduce wasteful consumption.

Many of the tools to fix our global problems are there. We can address this global crisis by taking these aforementioned steps and building them out with new, bold initiatives. I hope the IPBES' assessment will be the signal we all need to start taking aggressive action. Rather than curl up in a ball in fear, I prefer to visualize the better, brighter, fairer, safer, more lovely world that will result from taking the actions necessary.

Susan Casey-Lefkowitz directs NRDC's Climate and Clean Energy, Healthy People and Thriving Communities, Nature, and International programs.

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A net-casting ogre-faced spider. CBG Photography Group, Centre for Biodiversity Genomics / CC BY-SA 3.0

Just in time for Halloween, scientists at Cornell University have published some frightening research, especially if you're an insect!

The ghoulishly named ogre-faced spider can "hear" with its legs and use that ability to catch insects flying behind it, the study published in Current Biology Thursday concluded.

"Spiders are sensitive to airborne sound," Cornell professor emeritus Dr. Charles Walcott, who was not involved with the study, told the Cornell Chronicle. "That's the big message really."

The net-casting, ogre-faced spider (Deinopis spinosa) has a unique hunting strategy, as study coauthor Cornell University postdoctoral researcher Jay Stafstrom explained in a video.

They hunt only at night using a special kind of web: an A-shaped frame made from non-sticky silk that supports a fuzzy rectangle that they hold with their front forelegs and use to trap prey.

They do this in two ways. In a maneuver called a "forward strike," they pounce down on prey moving beneath them on the ground. This is enabled by their large eyes — the biggest of any spider. These eyes give them 2,000 times the night vision that we have, Science explained.

But the spiders can also perform a move called the "backward strike," Stafstrom explained, in which they reach their legs behind them and catch insects flying through the air.

"So here comes a flying bug and somehow the spider gets information on the sound direction and its distance. The spiders time the 200-millisecond leap if the fly is within its capture zone – much like an over-the-shoulder catch. The spider gets its prey. They're accurate," coauthor Ronald Hoy, the D & D Joslovitz Merksamer Professor in the Department of Neurobiology and Behavior in the College of Arts and Sciences, told the Cornell Chronicle.

What the researchers wanted to understand was how the spiders could tell what was moving behind them when they have no ears.

It isn't a question of peripheral vision. In a 2016 study, the same team blindfolded the spiders and sent them out to hunt, Science explained. This prevented the spiders from making their forward strikes, but they were still able to catch prey using the backwards strike. The researchers thought the spiders were "hearing" their prey with the sensors on the tips of their legs. All spiders have these sensors, but scientists had previously thought they were only able to detect vibrations through surfaces, not sounds in the air.

To test how well the ogre-faced spiders could actually hear, the researchers conducted a two-part experiment.

First, they inserted electrodes into removed spider legs and into the brains of intact spiders. They put the spiders and the legs into a vibration-proof booth and played sounds from two meters (approximately 6.5 feet) away. The spiders and the legs responded to sounds from 100 hertz to 10,000 hertz.

Next, they played the five sounds that had triggered the biggest response to 25 spiders in the wild and 51 spiders in the lab. More than half the spiders did the "backward strike" move when they heard sounds that have a lower frequency similar to insect wing beats. When the higher frequency sounds were played, the spiders did not move. This suggests the higher frequencies may mimic the sounds of predators like birds.

University of Cincinnati spider behavioral ecologist George Uetz told Science that the results were a "surprise" that indicated science has much to learn about spiders as a whole. Because all spiders have these receptors on their legs, it is possible that all spiders can hear. This theory was first put forward by Walcott 60 years ago, but was dismissed at the time, according to the Cornell Chronicle. But studies of other spiders have turned up further evidence since. A 2016 study found that a kind of jumping spider can pick up sonic vibrations in the air.

"We don't know diddly about spiders," Uetz told Science. "They are much more complex than people ever thought they were."

Learning more provides scientists with an opportunity to study their sensory abilities in order to improve technology like bio-sensors, directional microphones and visual processing algorithms, Stafstrom told CNN.

Hoy agreed.

"The point is any understudied, underappreciated group has fascinating lives, even a yucky spider, and we can learn something from it," he told CNN.

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