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Natural shields against global warming being weakened: study

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PARIS — The soil and the ocean are being weakened as buffers against global warming, in a vicious circle with long-term implications for the climate system, say two new investigations.

If the seas and the land are less able to soak up or store greenhouse gases, more of these carbon emissions will enter the atmosphere, holding in even more heat from the sun.

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A study published in Nature on Thursday says a gradual increase in atmospheric carbon dioxide (CO2) over the last half-century has accelerated the release of methane and nitrous oxide in the soil.

These gases are respectively 25 and 300 times more effective at trapping radiation than CO2, the principal greenhouse gas by volume.

“This feedback to our changing atmosphere means that nature is not as efficient in slowing global warming as we previously thought,” said Kees Jan van Groenigen, a professor at Trinity College Dublin and the paper’s lead author.

Earlier studies examining how additional CO2 affects the capacity of different soils — in forests, grasslands, wetlands and agricultural fields — to either absorb or release these two gases yielded conflicting results.

When van Groenigen and colleagues reviewed 49 such studies, however, two patterns emerged.

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More CO2 increased nitrous oxide in all soils, but soils in rice paddies and wetlands released more methane in particular.

The culprits in both cases are microscopic soil organisms that breathe in CO2 and “exhale” methane. The more carbon dioxide in the air, the more these single-cell greenhouse-gas factories thrive.

If the calculations are right, the carbon “credit” that is attributed to faster plant growth driven by extra CO2 in the air must be revised, say the researchers.

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This “credit” helps to offset the negative impact of greenhouse gases — but the new data suggests it should be written down by a fifth.

“By overlooking the key role of these two greenhouse gases, previous studies may have overestimated the potential of ecosystems to mitigate the greenhouse effect,” van Groenigen said.

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In the second study, published in the journal Nature Geoscience last Sunday, scientists in the United States highlight evidence that global warming is eroding the ability of the ocean to soak up CO2.

The world’s seas take up roughly one-third of all human carbon emissions, but how this “sponge” responds to rising CO2 levels is a tough question, mainly because data has been spotty geographically and didn’t cover long time periods.

Galen McKinley, a professor at the University of Wisconsin at Madison, worked with a team that looked at three decades of observational data from the North Atlantic.

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They found that rising air and water temperatures were slowing the pace at which carbon is absorbed across a large portion of this ocean’s subtropical zones.

“The ocean is taking up less carbon because of the warming caused by the carbon in the atmosphere,” McKinley said.

Up to now, scientists reasoned that only when carbon content in the ocean rose faster than in the atmosphere could one say that the capacity to take in CO2 had diminished.

But the new study shows that the ocean “sink” can be weakened even without this visible sign.

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“More likely, what we are going to see is that the ocean will keep its equilibration [the balance between atmospheric and ocean carbon levels] but it doesn’t have to take up as much carbon to do it because it’s getting warmer at the same time.”

She explained that warmer water cannot hold as much CO2 as colder water. As a result, as the ocean’s temperature rises, its “carbon capacity” decreases.


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As coronavirus spikes break new records Dr. Fauci reveals Trump doesn’t even speak to him anymore

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President Donald Trump tried to claim the mantle of a "wartime president," battling the "unseen enemy," but as it turns out one of the people who could best help him with the coronavirus battle is who's really "unseen."

Dr. Anthony Fauci, an immunologist and probably the most respected public health expert on the government's payroll, reveals the President of the United States no longer talks to him.

In fact, Trump hasn't talked to Fauci, the director of the National Institute of Allergy and Infectious Diseases (NIAID), in over a month – and hasn't been able to update Trump in at least two.

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Instagram to block all content promoting LGBT ‘conversion therapy’

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Instagram said on Friday it would block content that promotes so-called conversion therapy, which aims to alter a person's sexual orientation or gender identity, as pressure to ban the practice grows.

The social media giant announced earlier this year it would no longer allow adverts for conversion therapy services, which can range from counseling and "praying away the gay" to electric shocks and sexual violence.

"We don't allow attacks against people based on sexual orientation or gender identity," Tara Hopkins, Instagram's public policy director for Europe, Middle East and Africa said in an emailed statement.

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Trump campaign headquarters in Virginia shut down for COVID-19 after staffers pressured against wearing face masks

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President Donald Trump's campaign office, located in northern Virginia just outside of Washington, was forced to shut down after a COVID-19 outbreak.

Politico reported Friday that for a week cleaners were brought into the headquarters to scrub surfaces, disinfect equipment and try and stave off the coronavirus from hitting the campaign more than it already has.

While in Tulsa, Oklahoma, eight members of Trump's advance team contracted the coronavirus, including Secret Service agents. While in Arizona the following week, more of Trump's Secret Service got the virus. To make matters worse, when Trump headed to South Dakota for a Fourth of July celebration, his son's girlfriend, who also works on the campaign, contracted the virus.

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