Emma Critchley Emma Critchley Being immersed in water is a powerful scenario that resonates not only with me as an artist but unites us all; it is something we have all experienced.
A debate is brewing among researchers about removing carbon dioxide from the atmosphere. NASA Advertisement Scientists increasingly agree that it might be impossible to cap global temperatures at 1.
In other words, global temperatures could continue to rise without any clear stopping point, and policymakers could still claim that they will be brought back within acceptable limits eventually.
Although rarely mentioned by policymakers, "negative emissions" technology—the idea of sucking carbon dioxide out of the air to bring global temperatures down—is essentially built into the models that scientists use to explore different climate scenarios.
And many modeling scenarios assume that a 2-degree threshold may require negative emissions, although it might be possible to reach that goal with heavy-handed mitigation efforts. In fact, scientists disagree on exactly what methods could be used. Some have suggested a future in which machines are used to chemically scrub carbon dioxide out of the sky.
Other experts have proposed combining bioenergy with carbon capture and storage technology, an approach nicknamed "BECCS.
The bioenergy power plants they feed would be equipped with carbon-capturing technology to trap the emissions. Even this approach may have its shortcomings. And the lack of urgency may be tied to the fact that there are no clearly defined goals for when or how the technology should be deployed.
What is the last year by which global temperatures should be back below a 1. How acceptable is it to overshoot either goal?
And they also say that future reports from the Intergovernmental Panel on Climate Change should exclude any overshoot scenarios associated with the 2-degree threshold, another effort at keeping global climate goals strict and their required action clearly defined.
Still, there are plenty of other concerns about overshoot scenarios, even with their limits clearly outlined. Other scientists have warned about the dangers of assuming that negative emissions will solve the climate problem. Then, if it proves useful in the future, it will only add to an already aggressive global climate action plan.
Overshoot scenarios may be a useful way of looking at the global climate problem if their limitations are understood, the authors suggest.
That could prevent global climate targets from becoming "mere benchmarks that can be crossed for extended periods of time.zoonoses, animal welfare, animal health,food safety,veterinary,animal disease,animal,health,animal production,Bernard Vallat.
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