Leading scientists set out resource challenge of meeting net zero emissions in the UK by 2050  The Natural History Museum

Incineration is widely used in the United States to reduce the volume of waste. Hundreds of incinerators -- including industrial kilns, boilers, and furnaces -- combust municipal and hazardous waste, while many more are used to burn medical waste.

By expending too many resources to inspect cleaner low-emitting vehicles, coupled with a lack of effective ways to deal with the dirtiest ones, states are missing opportunities to reduce air pollution.

Current federal tax provisions have minimal net effect on greenhouse gas emissions, according to a new report from the National Research Council.

There is no substitute for dramatic reductions in greenhouse gas emissions to mitigate the negative consequences of climate change, a National Research Council committee concluded in a two-volume evaluation of proposed climate-intervention techniques.

The U.S. should take bold steps to improve measurement, monitoring, and inventories of methane emissions caused by human activities, says a new report from the National Academies of Sciences, Engineering, and Medicine.

A new report from the National Academies of Sciences, Engineering, and Medicine outlines a research agenda for improving the commercial viability of technologies that turn greenhouse gases from the burning of fossil fuels into useful products such as fuels, construction materials, and chemicals.

Traffic on the Hollywood Freeway in Los Angeles in 2018. The Trump administration is weakening auto pollution standards, rolling back a key Obama-era policy that sought to curb climate change.; Credit: Damian Dovarganes/AP

The Trump administration has finalized its rollback of a major Obama-era climate policy, weakening auto emissions standards in a move it says will mean cheaper cars for consumers.

"By making newer, safer, and cleaner vehicles more accessible for American families, more lives will be saved and more jobs will be created," U.S. Secretary of Transportation Elaine L. Chao said in a statement.

But consumer watchdog organizations, environmental groups and even the Environmental Protection Agency's own scientific advisory board have raised concerns about that rationale, saying the weakened standards will lead to dirtier air and cost consumers at the gas pump long-term.

Environmental Protection Agency administrator Andrew Wheeler called the new rule a move to "correct" greenhouse gas emissions standards that were costly for automakers to comply with.

"Our final rule...strikes the right regulatory balance that protects our environment, and sets reasonable targets for the auto industry," Wheeler said in a statement.

The Safer Affordable Fuel-Efficient (SAFE) Vehicles Rule will toughen carbon dioxide emissions standards by 1.5% a year through model year 2026, compared to about 5% a year under the Obama policy.

The Trump administration originally proposed freezing the standards altogether without any increase. It modified the rule after push back from not only environmental groups but also some automakers, who worried they will be out of step in a global marketplace increasingly geared toward lower emission cars and trucks.

Still, critics say the new rule will lead to nearly a billion additional metric tons of climate warming CO2 in the atmosphere, and that consumers will end up losing money by buying about 80 billion more gallons of gas.

"This rule will lead to dirtier air at a time when our country is working around the clock to respond to a respiratory pandemic whose effects may be exacerbated by air pollution," said U.S. Senator Tom Carper (D-Del.) in a statement. He's the top Democrat on the Senate Environment and Public Works Committee.

The Trump administration asserts the new rule will save lives because Americans will buy newer, safer vehicles. But Carper points out that its own analysis finds there would be even more premature deaths from increased air pollution.

For that reason and others, the new standards are sure to face legal challenges. In fact, even the Trump administration's own science advisers have said "there are significant weaknesses in the scientific analysis of the proposed rule."

"The rollback of the vehicle emissions standards is based on analysis that is shoddy even by the shockingly unprofessional standards of Trump-era deregulation," said Richard Revesz of the Institute for Policy Integrity and Dean Emeritus at New York University School of Law.

California and other states are also likely to file suit against the rule. They've asserted their long-standing right to set their own, stricter emissions standards, something the Trump administration has also challenged.

A worst case scenario for automakers would be different standards in different states. The new policy may ultimately be decided by the U.S. Supreme Court, but the uncertainty waiting for that would exact its own toll on an industry that must plan years ahead.

Thomas Pyle, President of the American Energy Alliance, welcomed the new standards. In a statement, he said the Obama-era mandate was "impossible to achieve without dramatically altering the automobile market or making the cost of vehicles out of reach for most American families. This new... rule will make cars more affordable for consumers at a time when they need it most."

The Trump administration has been pushing ahead with a number of environmental rollbacks, aiming to finalize them well ahead of November's election. That would make it harder for a Democratic president, if one were elected, to reverse them again.

This content is from Southern California Public Radio. View the original story at SCPR.org.

Several countries around the world are emitting less carbon due to the pandemic slowdown, but the climate will continue to warm.; Credit: Andy Buchanan/AFP via Getty Images

With the dramatic reduction in car traffic and commercial flights, carbon emissions have been falling around the globe. If the slowdown continues, some are estimating the world could see the largest drop in emissions in the last century.

Still, overall greenhouse gas emissions in the atmosphere are still going up and the decline will likely be smaller than what scientists say is necessary to avoid the worst impacts of climate change.

So far, the effects are just starting to appear. In China, the first country to lock down, greenhouse gas emissions dropped an estimated 25% in February as factories and industrial producers slowed output. That decreased coal burning, which has come back slowly since then.

"A month or two of shelter in place will drop carbon dioxide emissions a few percent here or there, but it won't change the year substantially unless we stay like this for some time," says Rob Jackson, environmental scientist at Stanford University.

The declines are still too small to be read by greenhouse gas observatories around the world, like the one on top of the Mauna Loa volcano in Hawaii, given the natural changes in atmosphere this time of year. Because much of the Earth's land mass is in the northern hemisphere, plants and forests there cause carbon levels to fluctuate as they bloom in the spring, drawing carbon dioxide from the air.

If countries continue shelter-at-home orders, emissions declines could be greater. The U.S. Energy Information Administration estimates U.S. emissions from gas and energy use could drop more than 7% this year, similar to a 2009 decline during the financial crisis.

Worldwide, early estimates put global emissions dropping around 4%. Still, that's less than the 7.6% the U.N. says is needed to avoid the worst impacts of climate change by limiting warming to 1.5 degrees Celsius.

To achieve those cuts, scientists say more fundamental changes are needed, like switching to renewable energy.

"This isn't the way we want to reduce our fossil fuel emissions," says Jackson. "We don't want tens of millions of people being out of work as a path to decarbonizing our economy. We need systemic change in our energy infrastructure and new green technologies."

Still, Jackson says the recent changes are providing useful insights.

"It's as if a third of the cars on the road were suddenly electric, running on clean electricity and the air pollution is plummeting," says Jackson. "It's really a remarkable experiment and it shows the benefits of clean energy."

This content is from Southern California Public Radio. View the original story at SCPR.org.

Municipal solid waste (MSW) landfills, which consist of everyday consumer items, are potential long-term sources of emissions that could threaten the environment and human health if they are not managed carefully after closure. New research has presented a methodology to estimate future emission levels for closed MSW landfills and the impact of different aftercare strategies.

A recent study compares the effects of organic, ‘natural’ fertilisers, such as compost, with mineral, synthetic fertilisers, such as urea, on N2O emissions from Mediterranean soil. It suggests that there is little difference between the fertilisers, but that pig slurry offers the best overall balance in terms of emissions and crop yield.

Reducing meat and dairy consumption would help reduce greenhouse gas (GHG) emissions from farming. A recent study describes the "ecological leftovers" approach to reducing livestock-related GHGs, which assumes that a sustainable number of livestock can be calculated on the basis of available marginal land, unsuitable for other purposes, and available agricultural by-products, which could be used as feed.

Pollen allergy is a common cause of allergic respiratory diseases such as hay fever and asthma. A recent continent-wide study suggests that rising carbon dioxide (CO2) emissions over the last 30 years may be increasing pollen counts especially in European cities, which could have serious consequences for public health.

A new study by European researchers highlights the important contribution of greenhouse gases (GHGs) other than carbon dioxide to climate change and suggests policy measures to help reduce their impact. The study provides improved estimates of the current GHG balance of Europe, taking nitrous oxide and methane into account.

Although the public are largely aware of climate change, their understanding of how they produce and manage carbon is generally not sufficient to lead to changes in behaviour and lifestyle, according to a recent study. The researchers therefore recommend policy action to increase the ‘carbon capability’ of the general public.

Over a 20-year time period, the greenhouse gas (GHG) footprint of shale gas is greater than that of coal, oil or conventional gas, according to a recent study. Methane emissions make up most of this footprint. This suggests that substituting conventional fossil fuels with shale gas may not have the desired effect to mitigate climate warming in the short-term.

Technological advances in European cement production could reduce energy consumption by up to 10% and CO2 emissions by 4%, according to a new analysis. The research suggests that initial costs of some of the pending technological improvements could be recouped in as little as a year.

Rising levels of atmospheric carbon dioxide (CO2) is likely to cause some soils to release large quantities of two potent greenhouse gases (GHGs), nitrous oxide and methane, according to a recent analysis. The results suggest that the contribution of soils and terrestrial ecosystems to slow climate change has been overestimated.

Permafrost and wetlands in high latitudes could switch from carbon sink to carbon source by the end of the century, according to a recent study. Using a model of terrestrial ecosystems that showed how carbon is stored and released in soils at high latitudes, researchers revealed that climate change could cause these soils to release much more carbon than previously predicted.

A different picture of greenhouse gas (GHG) emissions can be achieved if responsibility for emissions from different economic sectors is placed with the end energy users, according to a new report from the European Environment Agency (EEA). This approach makes sectors such as households responsible for many emissions that would otherwise be attributed to the energy industry.

Regulators should establish a process to consider the full lifecycle greenhouse gas (GHG) emissions of electric vehicles, according to a new US study. This would help ensure that vehicle emissions regulations are placed on a sound scientific basis, manufacturers continue to improve the efficiency of electric vehicles, and the full benefit of regulations to limit GHG emissions from vehicles are realised, say the researchers.

The growing use of Information and Communication Technology (ICT) services is producing an increasing amount of greenhouse gas (GHG) emissions. New research has proposed a network model spanning Europe, USA and Canada that uses ‘cloud computing’ to supply renewable energy to IT data centres.

The benefits of CO₂ cuts made now, such as avoided floods and droughts, will be felt within the lifetimes of most people alive today, new research indicates. The study’s authors say their work dispels myths that the main effects of CO₂ emissions will not be felt for many decades. They estimate that it could take 10 years for the maximum warming effects of a one-off CO₂ emission to occur.

How rice paddy fields are managed significantly influences the release of greenhouse gases (GHGs), a recent study concludes. Permanently flooded soils release more methane than soils that are flooded and then dried between production periods, for example. In general, the researchers recommend growing other crops in dried soil between production cycles, as well as limiting nitrogen fertilisers, to minimise the release of methane and nitrous oxide.

Researchers have proposed a global roadmap for decarbonisation over the coming decades. The roadmap is based on the idea of a simple heuristic, described by the researchers as ‘carbon law’, of halving carbon dioxide (CO2) emissions every decade from 2020 to 2050. The researchers say that, if combined with the development of new technologies and efforts to reduce CO2 emissions from land use, this target could lead to a carbon-neutral global economy by 2050.

Most emissions of nitrous oxide (N2O) are linked to the use of nitrogen (N) fertiliser in agriculture, highlighting a need for agricultural management practices that reduce emissions while maintaining agronomic productivity. A new study has assessed the long-term impact of conventional tillage (CT — where soil is prepared for agriculture via mechanical agitation) and no-tillage (NT) systems on soil N2O emissions and crop productivity in rain-fed Mediterranean conditions. The findings show that, over a period of 18 years, mean yield-scaled (i.e. per unit grain yield) soil N2O emissions (YSNE) were 2.8 to 3.3 times lower under NT than CT. The researchers therefore recommend NT as a suitable strategy by which to balance agricultural productivity with lower soil N2O emissions in rain-fed Mediterranean agroecosystems.

The most effective way to lower the greenhouse gas (GHG) emissions associated with metal production is to pursue a circular economy for the material in the long term, says a recent study. This century will see a high demand for seven major metals; the resultant overall environmental impact is expected to outweigh any environmental savings that may result from greener production processes or an increased use of renewable energy.

Greenhouse gas (GHG) emissions from municipal solid waste (MSW) in the UK are about five times greater than those of Germany, according to a recent study. To compare this figure with transport emissions, this difference would be equivalent to removing 1.2 million cars from UK roads.

Municipal solid waste (MSW) landfills, which consist of everyday consumer items, are potential long-term sources of emissions that could threaten the environment and human health if they are not managed carefully after closure. New research has presented a methodology to estimate future emission levels for closed MSW landfills and the impact of different aftercare strategies.

A new method of processing food waste into fertiliser has been outlined in a recent study. The process uses a digester system with microorganisms to break down organic waste into fertiliser. The resultant fertiliser was used in a low-energy greenhouse to produce a range of food crops. The method is a potential way to utilise food waste and reduce the energy consumption of food production as part of a circular economy.

Analysis of the operation of a novel, micro-scale anaerobic digester has shown that this technology could provide a useful means of processing food waste in urban areas. The study found that the digester, located in London and fed mainly with local food waste, avoided 3.9 tonnes of greenhouse gas emissions, while providing biogas for cooking, heat and power. Anaerobic digestion on this scale could play a part in reducing the amount of food waste that goes to landfill1 and contribute to the circular economy.

The growing use of Information and Communication Technology (ICT) services is producing an increasing amount of greenhouse gas (GHG) emissions. New research has proposed a network model spanning Europe, USA and Canada that uses ‘cloud computing’ to supply renewable energy to IT data centres.

While energy-efficiency gains are needed to lower Europe’s greenhouse gas emissions, low-carbon technologies are also crucial if we are to meet ambitious EU emissions targets in the long term, new comparative research concludes.

Emissions of sulphur dioxide (SO2) and nitrogen oxides (NOx) have fallen significantly across Europe since 1960. According to recent research, this is caused by a combination of factors including improved energy efficiency, a changing fuel mix and specific emission control measures. At the same time CO₂ emissions have only increased moderately, mainly due to improvements in energy efficiency.

The livestock sector is estimated to contribute 14.5% of all global anthropogenic greenhouse gas (GHG) emissions. This study estimated the costs of reducing emissions from ruminant livestock using five different practices. The findings will help policymakers to understand the cost effectiveness of different interventions in the sector, and the contribution that different policies could make to addressing climate change.

An inventory of carbon footprints has been developed for 177 regions across 27 EU Member States. The map is the first to quantify greenhouse gas emissions associated with household consumption across the EU. It reveals significant regional differences based on income, household size and urban versus rural living.

A new UK study suggests that there are associations between obesity, physical activity, and levels of CO2 emissions from transport. These associations seem mostly to reflect the fact that obese people tend to travel longer distances by motorised forms of travel. They may also partly reflect less ‘active travel’ by bicycle or walking by obese people.

Speed constraints for aircraft are put in place, at some airports, to minimise noise pollution in local areas, however, such practices can be very fuel-inefficient. New research has now shown that relaxing departure speed limits could substantially reduce CO2 emissions, while maintaining acceptable noise levels.

Carbon emissions from Dutch road networks could be reduced by almost a third if more innovative materials and processes were used, a new study suggests. Researchers assessed the potential benefits associated with 10 innovations in road construction and maintenance, and compared them to conventional materials and processes.

Long-distance travelling accounts for a significant number of miles travelled per person, but estimates of its greenhouse gas emissions are lacking. Using data from Belgium and the Netherlands, this study estimates that long-distance journeys account for 40–50% of total mileage and 50% of greenhouse gas emissions of all people transport in Western Europe.

Countries that appear to have reduced greenhouse gas (GHG) emissions through reforestation may have simply “displaced” the emissions to another country, by increasing their imports of food, timber and wood. A new EU study highlights the need to recognise this ‘loophole’ in ongoing emission targets.

A new study suggests that, although the global terrestrial carbon sink remained relatively stable from 1990 to 2007, the effects of tropical forests were virtually neutral because CO2 emissions from deforestation offset their carbon sink.

Locally managed carbon budgets for housing and transport could be highly effective in reducing greenhouse gas (GHG) emissions, according to researchers. They have suggested a policy framework with standardised methods to monitor city carbon budgets with local flexibility for remaining within these budgets.

According to a new study, an average UK household could reduce its greenhouse gas (GHG) emissions by around 37 per cent through lifestyle changes whilst maintaining an acceptable standard of living.

China does not export cars to Europe, yet it has adopted the Euro emissions standard for vehicles. A recent study argues this is because international standards can encourage foreign investors to share advanced technical knowledge with companies in developing and emerging economies – thus bringing a package of environmental and economic benefits. In China’s case, its car industry is now better prepared for future trade in a global market, thanks to this strategy.

Climate change objectives are now featured in a wide range of policies, including the European Rural Development Programme, which promotes sustainable agricultural interventions. This study describes the net greenhouse gas emissions for these interventions across Europe. The findings could help policymakers to better meet multiple social, economic and environmental objectives, although the authors say a broader perspective may be needed to determine the overall benefit of interventions.

Landfill taxes and ‘enhanced waste management’ practices have been introduced to reduce the amount of waste that goes to landfill and to convert waste into useful products. This study investigated the interplay of these two policy options in Belgium, generating findings that could help Europe move towards a resource-efficient, circular economy.

Marine diesel contains sulphur compounds, which generate sulphur oxide (SOx) pollution and acid rain. Ships can use mitigating technologies to reduce their SOx emissions, but these can also have a negative environmental impact. The International Maritime Organization (IMO) introduced stringent legislation to control these, aspects of which are incorporated into EU policy. This study examined the implications of the IMO’s policy and recommends a number of design solutions to help ships comply.

Reusing waste water for non-drinking uses in decentralised plumbing networks may improve the efficiency of water supply in urban areas, a new study has found. Modelling this approach in San Francisco, researchers found that, depending on the local geography, a decentralised water supply could lead to energy savings and reductions in greenhouse gas emissions from water treatment of around 30%. Improvements in emerging water-treatment technologies are likely to lead to further savings, which could help increase the efficiency of urban water supply.

A UK solar park has been found to change the local microclimate, reports recently published research. Moreover, the microclimate coupled with management activities had an impact on greenhouse gas emissions and plant-community diversity and productivity under the solar panels. The study’s authors say their research provides a starting point for considering how to improve solar-park design in order to deliver co-benefits for biodiversity and farming, and minimise any negative environmental effects.