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New analysis has found increasing emissions of several ozone-depleting chemicals despite their production being banned for most uses under the Montreal Protocol—and a loophole in the rules is likely responsible. According to the researchers, emissions from these CFCs currently do not significantly threaten ozone recovery.
A study led by Norwegian climate center CICERO has found that the global warming effect of leaked hydrogen is almost 12 times stronger than that of CO 2. Rather, it is the leaking of hydrogen from production, transportation and usage that adds to global warming. A global warming potential of 11.6 Sand et al. Sand et al.
Illustration of projected ozonechanges in the South Coast region due to climatechange in 2050. Areas in orange and red could see ozone concentrations elevated by 9 to 18 parts per billion. Our study reveals that climatechange and regional air pollution are intertwined problems. Click to enlarge.
Levels of two major air pollutants have been reduced significantly since lockdowns began in response to the COVID-19 pandemic, but a secondary pollutant—ground-level ozone—has increased in China, according to new research. Ozone is harmful to humans at ground-level, causing pulmonary and heart disease. —Guy Brasseur.
Significant climate anomalies 2008/2009. Source: ClimateChange Compendium. Global emissions were growing by 1.1% The developing and least-developed economies, 80% of the world’s population, accounted for 73% of the global growth of emissions in 2004. Click to enlarge. Earlier post.). Earlier post.).
Global benefits from full implementation of the identified measures in 2030 compared to the reference scenario. The climatechange benefit is estimated for 2050 and human health and crop benefits are for 2030 and beyond. Black carbon and tropospheric ozone are harmful air pollutants that also contribute to climatechange.
It makes an important contribution to the scientific understanding we have of the role of aviation for climatechange—an understanding decision-makers and politicians may need on the way to achieving the goals of the Paris Agreement. This new study is based on a thorough review of a decade of research on aviation emissions.
The study will appear next month in the peer-reviewed journal ClimaticChange Letters. Relying more on natural gas would reduce emissions of carbon dioxide, but it would do little to help solve the climate problem. However, the effects of natural gas on climatechange have been difficult to calculate. degrees F (0.1-0.2
Noting the references in scientific and policy literature to the need for fast-action mitigation to help avoid DAI and abrupt climatechanges, the authors define “fast-action” to include regulatory measures that can begin within 2–3 years, be substantially implemented in 5–10 years, and produce a climate response within decades.
Schematic diagram of the trade-offs between the implications for regional air quality and globalclimatechange of new policies for management of the atmosphere. The complex roles that ozone and aerosols play in the atmosphere provide examples of such trade-offs. Source: NOAA. Click to enlarge.
The rapidly growing space industry may have a greater climate effect than the aviation industry and undo repair to the protective ozone layer if left unregulated, according to a new study led by UCL and published in the journal Earth’s Future as an open-access paper. The space industry is one of the world’s fastest growing sectors.
have developed a simulator able to predict tropospheric ozone concentrations across the whole of South and East Asia. Tropospheric ozone is the main cause of photochemical smog, an atmospheric pollutant harmful to human health and plant growth. Toyota Motor Corporation (TMC) and Toyota Central R&D Labs.,
Exposure to ozone, long associated with impaired lung function, is also connected to health changes that can cause cardiovascular disease such as heart attack, high blood pressure and stroke, according to a new study of Chinese adults. They monitored indoor and outdoor ozone levels, along with other pollutants.
A NASA-led study has documented an unprecedented depletion of Earth’s protective ozone layer above the Arctic last winter and spring caused by an unusually prolonged period of extremely low temperatures in the stratosphere. The same ozone-loss processes occur each winter in the Arctic.
The decrease in CO 2 equivalent emissions of ODSs (ozone-depleting substances: CFCs, halons, HCFCs, and others) may be offset by the projected increase in their non-ozone depleting substitutes (HFCs) (lines designated as HFC scenarios). The contribution of HFCs to climate forcing is currently less than 1% of all greenhouse gases.
Through a recent modeling experiment, a team of NASA-funded researchers have found that future concentrations of carbon dioxide and ozone in the atmosphere and of nitrogen in the soil are likely to have an important but overlooked effect on the cycling of water from sky to land to waterways.
CSIRO scientists have developed a new way to account for ozone in computer simulations of the climate. This latest modeling shows that the oceans take much less ozone out of the atmosphere than previously thought. Ozone (O 3 ) is formed by reactions of chemicals such as nitrogen oxides and volatile organic compounds—i.e.,
The global market for rocket launches may require more stringent regulation in order to prevent significant damage to Earth’s stratospheric ozone layer in the decades to come, according to a new study by researchers in California and Colorado. Darin Toohey.
The 100-year global warming potentials (GWPs) for methane, CO, and NO x (per Tg N) as given in the AR4 and in this study when including no aerosol response; the direct radiative effect of aerosol responses; and the direct+indirect radiative effects of aerosol responses. It’s a seemingly minor change, but it makes a difference to the climate.
Following this BAU scenario, the researchers projected that air quality for the global average citizen in 2050 would be almost comparable to that for the average citizen in East Asia in the year 2005—an outcome which underscores the need to pursue emission reductions, according to the authors. —Pozzer et al.
Currently, anthropogenic N 2 O emissions represent the largest contribution to ozone depletion. The study, published online 27 August in the journal Science , for the first time evaluated nitrous oxide emissions from human activities in terms of their potential impact on Earth’s ozone layer. Source: Ravishankara et al. The team, A.R.
While they do not deplete the ozone layer, many are highly potent greenhouse gases whose use is growing rapidly as replacements for ozone-depleting substances being phased out under the Montreal Protocol. Left unabated, HFC emissions could grow to nearly 20% of carbon dioxide emissions by 2050, a serious climate mitigation concern.
Temperature change per transport work by mode for various years after the emissions: per passenger kilometer for passenger travel (left) and per ton-kilometer for freight transport (right). Global average values for the year 2000. Tags: Aviation ClimateChange Emissions. Bars represent 1 SD. Click to enlarge. Technol. ,
That’s three times the amount estimated by the Intergovernmental Panel on ClimateChange (IPCC). This new global emission estimate is startling. Nitrous oxide is a potent greenhouse gas that contributes to climatechange and stratospheric ozone destruction.
used a climate model to analyze the effects of a wide range of chemical species, including carbon dioxide, nitrous oxide, methane, organic carbon, black carbon, nitrate, sulfate, and ozone, from 13 sectors of the economy from 2000 to 2100. It’s good for the climate in the short term and long term, and it’s good for our health.”.
Geoengineering is defined as the deliberate large-scale intervention in the Earth’s climate system in order to moderate global warming. Geoengineering and its consequences are the price we may have to pay for failure to act on climatechange. Unless emissions of carbon dioxide can be greatly reduced—i.e.,
The researchers believe the measurements will substantially impact the understanding of atmospheric chemistry mechanisms—in particular, in the more rapid formation of secondary aerosols, important in the formation of local smog as well as in globalclimatechange. Carl Percival. —Welz et al. —Marston (2012).
Aviation climatechange impacts pathway. An an example, they point out that an SPK fuel option with zero life cycle GHG emissions would offer a 100% reduction in GHG emissions but only a 48% reduction in actual climate impact using a 100-year time window and the nominal climate modeling assumptions in the paper.
The US, Canada, and Mexico have submitted a proposal to strengthen climate protection under the Montreal Protocol— the international treaty that phases out the production of a number of substances responsible for ozone depletion. Climate protection from the Montreal and Kyoto protocols. Source: IGSD. Click to enlarge.
A global phase down of HFCs could potentially reduce some 90 gigatons of CO 2 equivalent by 2050, equal to roughly two years worth of current global greenhouse gas emissions. While they do not deplete the ozone layer, many are highly potent greenhouse gases.
Globalozone-depleting substances (ODSs) and HFC emissions (A), global CO 2 and HFC emissions (B), and ODS, HFC, and CO 2 global RF (C) for the period 2000–2050. These HFCs, gases used in refrigerators and air conditioners, are substitutes for ozone-depleting gases, but they are also strong greenhouse gases.
Maersk Container Industry (MCI) is calling for tougher enforcement of European environmental legislation designed to protect the Earth’s ozone layer and help prevent climatechange. The global warming potential (called GWP) of a 40' reefer box with SuPoTec is reduced to about 1% compared with a container made with HCFC141b.
A two-year Cooperative Research Program conducted through SAE International to investigate the safety and environmental performance of the low-global-warming-potential (GWP) refrigerant HFO-1234yf for mobile air conditioning (MAC) systems has finished its study. Tags: ClimateChange Emissions Vehicle Systems.
The proposed cause or contribute finding concludes that that the combined emissions of CO 2 , CH 4 , N 2 O, and HFCs from new motor vehicles and motor vehicle engines contribute to the atmospheric concentrations of these key greenhouse gases and hence to the threat of climatechange.
Ethane reacts with sunlight and other molecules in the atmosphere to form ozone, which at the surface can cause respiratory problems, eye irritation and other ailments and damage crops. And they’re sufficient to explain much of the global shift in ethane concentrations. Hydrocarbons react with NO x and sunlight to produce ozone.
Decomposition of the decadal change in total global CO 2 emissions from fossil fuel combustion by four driving factors; population, income (GDP) per capita, energy intensity of GDP and carbon intensity of energy. The global economic crisis 2007/2008 only temporarily reduced emissions. WG III Summary for Policymakers.
They found that reductions in ground ozone during this 35-year period resulted in $600 million in increased production annually by the early 2010s. These aren’t the things that are providing the global population with its main source of calories. An open-access paper on the work appears in Nature Food. —Steven Davis.
Percent reduction in visible solar energy due to ambient PM (plus a small contribution from ozone) (A), only dust PM deposition (B) deposition of all PM components (C), and atmospheric and deposited combined (D; note change in scale). Credit: ACS, Bergin et al. Click to enlarge. —Michael Bergin.
The short-lived climate pollutants (also called super pollutants) include black carbon, a primary component of soot; tropospheric ozone, the principle component of urban smog; methane; and hydrofluorocarbons (HFCs). C in projected cumulative warming by 2050 and 1.1 °C C or more projected warming by 2100, IGSD says.
Chlorofluorocarbons (CFCs)—commonly used in refrigerators and air conditioners—play a role in creating a hole in the ozone layer over Antarctica. However, more complete reporting of global HFC emissions is required, as less than half of global emissions are currently accounted for. —Rigby et al.
The global warming potentials (GWP) of HFCs range from 140 (HFC-152a) to 11,700 (HFC-23), according to the US EPA. HFCs are chemicals are potential substitutes for ozone-depleting and climate-warming CFCs and HCFCs currently being phased out under the Montreal Protocol treaty to protect the ozone layer.
A side event organized by the International Nitrogen Initiative (INI) at the COP-15 United Nations ClimateChange Conference in Copenhagen will highlight nitrogen’s role in climatechange. Nitrogen and climate interactions are not yet adequately included in the Intergovernmental Panel on ClimateChange assessment process.
while the US GDP is projected to grow by 40%, according to the fifth National Communication on US climatechange actions submitted by the US Department of State to the United Nations Framework Convention on ClimateChange. The United States released previous Climate Action Reports in 1994, 1997, 2002, and 2006.
This is the second in a series of EaSM solicitations, and it remains focused on the prediction of future climates and their consequences for human systems on time scales of several decades and shorter and global to regional and finer spatial scales. Awards are expected to be in the range of $300,000 to $1,000,000 per year.
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