Tim McDonnell joined Climate Desk after stints at Mother Jones and Sierra magazine. He remains a cheerful guy despite covering climate change all the time. Originally from Tucson, Tim loves tortillas and epic walks.
Listen to the sound in that video. If I had to guess what it meant, soliciting sex would probably be pretty far down my list. It strikes me more as the sound a Chicago Bears fan might make after swilling a pitcher of Bud Light.
But new research has revealed for the first time that this mysterious bellowing is most likely the male koalas' mating call.
Weekends are always better when they start with koalas.
Despite their popularity, relatively little is known about koalas' social interactions, since they tend to be solitary and thus difficult to study. To overcome that challenge, researchers at Australia's University of Queensland fitted 21 koalas on St. Bees Island with GPS tracking collars during the summertime mating season.
Over two months, the GPS devices recorded how often koalas came into contact with one another. The scientists found that while male-female interactions increased during mating season, male-male encounters remained rare, suggesting that the male koalas had a way of avoiding each other while attracting females.
Bees are having a really hard time right now. For about a decade, they've been dying off at an unprecedented rate—up to 30 percent per year, with a total loss of domesticated honeybee hives in the United States worth an estimated $2 billion.
At first, no one knew why. But as my colleague Tom Philpott has reported extensively, in the last few years scientists have accumulated a compelling pile of evidence pointing to a class of insecticides called neonicotinoids. These chemicals are widely used in commercial agriculture but can have lethal effects on bees. Other pesticides are also adding to the toll. So are invasive parasites and a general decline in the quality of bees' diets.
Clearly, that combination of factors poses a pretty serious problem for anyone who likes to eat, since bees—both the domesticated kind and their wild bumblebee cousins, both of which are in decline—are the main pollinators of many major fruit and nut crops. The problem is so severe that this spring President Barack Obama unveiled the first-ever national strategy for improving the health of bees and other key pollinators.
Bees "are in serious and immediate risk from human-caused climate change."
Now, it appears that lurking in the background behind the ag-industry-related problems is an even more insidious threat: climate change. According to new research published in the journal Science, dozens of bumblebee species began losing habitat as early as the 1970s—well before neonicotinoids were as widespread as they are today. Since then, largely as a result of global warming, bees have lost nearly 200 miles off the southern end of their historic wild range in both the US and in Europe, a trend that is continuing at a rate of about five miles every year.
As temperatures increase (the US is about 1.5 degrees Fahrenheit warmer today, on average, than in 1900), many plant and animal species in the Northern Hemisphere are shifting their range north. But by analyzing a vast archive of bee distribution records reaching back more than a century, ecologists at the University of Ottawa showed that bees are not joining that trend. Instead of shifting north like many other species, the bees' range is only compressing in from the south, leaving less and less available habitat. That finding is illustrated in the chart below (and explained in more detail in the video at the bottom of this post, produced by Science).
Kerr et al, Science 2015
In a call with reporters, lead scientist Jeremy Kerr stressed that although pesticide use is a critical cause of bee mortality at local levels, it doesn't explain the continent-wide habitat shrinkage that stands out in the bee data. But temperature trends do.
"They are in serious and immediate risk from human-caused climate change," Kerr said. "The impacts are large and they are underway."
The question of why bees aren't pushing northward is a bit trickier, and it isn't resolved in this paper. But Kerr said he suspects the answer could be the relatively long time it takes for bees to reach a critical mass of population that can be sustained in new places.
President Barack Obama speaks after touring a solar facility in Nevada in 2012.
Rooftop solar power systems cost a lot less these days than they did five or 10 years ago, and with many solar companies now offering leases and loans, it's safe to say that going solar is more affordable than even before. That trend goes a long way to explaining why solar, while still making up less than 1 percent of the total US energy mix, is the fastest-growing power source in the country.
But access to solar power is still overwhelmingly skewed toward affluent households. Of the roughly 645,000 homes and business with rooftop solar panels in the US, less than 5 percent are households earning less than $40,000, according to a report earlier this year from the George Washington University Solar Institute. The typical solar home is 34 percent larger than the typical non-solar home, according to energy software provider Opower.
President Barack Obama wants to change that. On Monday the White House announced a package of initiatives to make solar more accessible for low-income households. The plans include a new solar target for federally subsidized housing and an effort to increase the availability of federally insured loans for solar systems.
Of the country's 645,000 solar homes and businesses, less than 5 percent are households earning less than $40,000.
Low-income households face a number of barriers to going solar. They're less likely to own their own roof, less able to access loans or other financing options for solar, and more likely to have subsidized utility bills that don't transfer the financial benefits of solar to the homeowner. And yet, in many ways low-income households stand to benefit the most from producing their own energy: The proportion of their income spent on energy is about four times greater than the national median, according to federal statistics. And because lower-income households tend to use less electricity overall than higher-income households, a typical solar setup covers more of their demand. The GW study found that a 4 kilowatt solar system, about the average size for a house, would cover more than half of a typical low-income household's energy needs and that if all low-income households went solar, they would collectively save up to $23.3 billion each year.
"[This is] aimed at taking directly on those challenges and making it easier and straightforward to deploy low-cost solar energy in every community in the country," senior White House climate advisor Brian Deesetold reporters in a call yesterday.
The initiative starts by tripling the target for solar on federally subsidized housing to 300 megawatts by 2020, as well as directing the Department of Housing and Urban Development to provide technical guidance for state and local housing authorities on how to go solar. The White House also announced more than $520 million in commitments from private companies, investors, NGOs, and state and local governments to pay for energy efficiency and solar projects for low-income households. The initiative places particular emphasis on so-called "community" solar, in which groups of households pool resources to build and maintain a shared solar system in their neighborhood.
Some states and power companies are already angling to support solar for low-income housing. Arizona Public Service, a Phoenix-area utility, recently launched a $28.5 million program to install its own solar panels on rooftops in its service area, specifically targeting low-income households. And New York's electricity regulators recently bolstered incentives for power companies that invest in energy efficiency and renewables. Con Ed, the power company serving most of New York City, plans to spend $250 million on such upgrades in Brooklyn and Queens, as an alternative to a $1 billion upgrade to the old natural gas-fired electric grid.
The president's plan builds on a commitment he announced earlier this year to train 75,000 workers for the solar industry (which is already adding jobs 10 times faster than the overall economy). It also dovetails neatly with Obama's larger climate objectives, especially his hotly-contested plan to reduce the nation's energy-related carbon emissions 30 percent by 2030, as well as the economy-wide climate targets that form the US bargaining chip for this year's UN climate negotiations in Paris.
For all those promises to work, "the question is how states and utilities can reduce their emissions, and the buildings that they serve are a critical part of that system," said Natural Resources Defense Council financial policy analyst Philip Henderson. "Making those buildings more efficient and using less energy from dirty power plants is a direct and essential way to meet those goals."
This article was originally published by the Guardianand is republished here as part of the Climate Desk collaboration. The video above was produced by Climate Desk.
Washington's notorious snowball-thrower was at it again—even on a June day with forecast highs of 92 degrees—as the Senate's most powerful environmental leader delivered a pep talk to activists who deny the science behind climate change.
Oklahoma Republican James Inhofe, who now chairs the Senate Environment and Public Works Committee despite famously calling global warming "the greatest hoax ever perpetrated on the American people," took a star turn on Thursday at the Heartland Institute, whose conferences function as a hub for climate deniers.
His message—that "God is still up there" and that Pope Francis should mind his own business—sent a clear signal to his fellow conservatives: Climate skeptics have a loyal—and newly powerful—friend in Congress.
Update (6/10/15): The Environmental Protection Agency today announced its finding that greenhouse gas emissions from airplanes endanger human health. On the basis of that finding, the EPA is expected to propose new rules later this summer to limit those emissions.
The Environmental Protection Agency is expected to declare soon that greenhouse gas emissions from airplanes are a danger to human health because they contribute significantly to climate change. Right now, air travel is the largest unregulated source of carbon pollution in the United States. But once the EPA releases its endangerment finding, the agency will be required under the Clean Air Act to issue new rules to restrict those emissions.
President Barack Obama has already used his executive authority to tackle emissions from vehicles and power plants, so airplanes seem like a logical next step.
Just how bad is flying for the climate? Per mile, per passenger, it's by far the most greenhouse-gas-intensive mode of transportation. But because Americans drive so much more often than they fly, it's still a relatively small slice of the overall pie. Here's how it breaks down.
Overall, domestic aviation is the eighth-largest source of greenhouse gas emissions nationwide:
Commercial airplanes (not counting military and private planes) are the fourth-largest source of travel-related greenhouse gas emissions:
According to an analysis by University of California-Berkeley researcher Chris Jones, air travel makes up a little more than 3 percent of the average American household's greenhouse gas footprint, assuming a household total of roughly one medium-length and four short round-trip flights per year. You can explore his awesome carbon footprint calculator here to find out how your personal carbon footprint compares. If you're like our friend Eric Holthaus (who now writes for Climate Desk partner Slate), planes could be a much bigger slice of the pie. (After Holthaus realized how much of an impact his flying habit was having, he vowed to give up air travel altogether.)
Calculating the carbon footprint of any particular flight is bit challenging compared to ground transportation. With cars, buses, and trains, carbon dioxide accounts for the vast majority of the greenhouse gas emitted. But because planes also leave behind a ton of water vapor (itself a potent greenhouse gas) high in the atmosphere, carbon dioxide "is only half the story with air travel," Jones explained. So the total greenhouse gas footprint of a single long flight, say from New York to San Francisco, is actually pretty huge, equal to more than 10 percent of the average American's annual carbon footprint.
So how does all this add up if you're trying to decide how to commute? Here's the breakdown for a trip I often take, from Washington, DC, to New York. Between the four main transit options (bus, car, train, plane), the bus clearly wins out in terms of the smallest footprint per mile, per passenger, according to data from the EPA and Jones. If you're traveling alone, Amtrak is the next best option; if you have a second person in your car, it's about the same for each of you as taking the train. By yourself, the car pollutes about twice as much as the train. Again, the plane is by far the worst.
Jones has found that air travel is more competitive, carbon-wise, over longer distances. That's because emissions peak during take-off and landing, so on short flights you get fewer miles per ton of emissions.
Icons, from Noun Project unless noted otherwise: Factory: Ricardo Moreira; House: Maurizio Pedrazzoli; heavy truck: Yorlmar Campos; light truck: Simon Child; boat: Gabriele Malaspina; fighter jet: Juan Garces; motorcycle: Olivier Guin; outlet: Juan Pablo Bravo; office: Alex Tai; shopping: Juan Pablo Bravo; food: Matt Brooks; US map: AlexanderZam/Shutterstock.