Global Warming Is Messing with the Jet Stream. That Means More Extreme Weather.

A new study links the buildup of greenhouse gas emissions to more frequent heat waves, floods and droughts in the Northern Hemisphere.

Greenhouse gases are increasingly disrupting the jet stream, a powerful river of winds that steers weather systems in the Northern Hemisphere. That's causing more frequent summer droughts, floods and wildfires, a new study says.


The speed and waviness of the northern jet stream, a river of wind across the Northern Hemisphere, is affected by the temperature difference between the Arctic and mid-latitudes. Credit: NASA

The findings suggest that summers like 2018, when the jet stream drove extreme weather on an unprecedented scale across the Northern Hemisphere, will be 50 percent more frequent by the end of the century if emissions of carbon dioxide and other climate pollutants from industry, agriculture and the burning of fossil fuels continue at a high rate.

In a worst-case scenario, there could be a near-tripling of such extreme jet stream events, but other factors, like aerosol emissions, are a wild card, according to the research, published today in the journal Science Advances.

Continue reading: Global Warming Is Messing with the Jet Stream. That Means More Extreme Weather.

A warming Arctic produces weather extremes in our latitudes

Atmospheric researchers at the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) have now developed a climate model that can accurately depict the frequently observed winding course of the jet stream, a major air current over the Northern Hemisphere. The breakthrough came when the scientists combined their global climate model with a new machine learning algorithm on ozone chemistry. Using their new combo-model, they can now show that the jet stream's wavelike course in winter and subsequent extreme weather conditions cold air outbreaks in Central Europe and North America are the direct result of climate change. Their findings were released in the Nature online portal Scientific Reports on 28 May 2019.

Photochem. Photobiol. Sci., 2019,18, 717-746, DOI: 10.1039/C8PP90062K

For years, climate researchers around the globe have been investigating the question as to whether the jet stream's winding course over the Northern Hemisphere -- observed with increasing frequency in recent years -- is a product of climate change, or a random phenomenon that can be traced back to natural variations in the climate system. The term "jet stream" refers to a powerful band of westerly winds over the middle latitudes, which push major weather systems from west to east. These winds whip around the planet at an altitude of roughly 10 kilometres, are driven by temperature differences between the tropics and the Arctic, and in the past, often reached top speeds of up to 500 kilometres per hour.

But these days, as observations confirm, the winds are increasingly faltering. They less often blow along a straight course parallel to the Equator; instead, they sweep across the Northern Hemisphere in massive waves. In turn, during the winter these waves produce unusual intrusions of cold air from the Arctic into the middle latitudes -- like the extreme cold that struck the Midwest of the USA in late January 2019. In the summer, a weakened jet stream leads to prolonged heat waves and dry conditions, like those experienced in Europe in e.g. 2003, 2006, 2015 and 2018.

Continue reading at (with link to full-text scientific paper): A warming Arctic produces weather extremes in our latitudes

The State of Climate Adaptation in Public Health: An Assessment of 16 U.S. States | CAKE: Climate Adaptation Knowledge Exchange

Climate change poses significant threats to the health of individuals and communities, as well as the delivery of healthcare services. Human morbidity and mortality rates are rising due to extreme heat events and changing patterns of water-borne and vector-borne diseases, and healthcare infrastructure is at risk from extreme events. Climate adaptation actions are taken to either avoid or take advantage of climate change impacts either by decreasing vulnerability or increasing resilience.



Read more and access the report at: The State of Climate Adaptation in Public Health: An Assessment of 16 U.S. States | CAKE: Climate Adaptation Knowledge Exchange

Opinion | Agroecology as Innovation

On July 3, the High Level Panel of Experts of the UN Food and Agriculture Organization (FAO) released its much-anticipated report on agroecology in Rome. The report signals the continuing shift in emphasis in the UN agency’s approach to agricultural development. As outgoing FAO Director General Jose Graziano da Silva has indicated, “We need to promote a transformative change in the way that we produce and consume food. We need to put forward sustainable food systems that offer healthy and nutritious food, and also preserve the environment. Agroecology can offer several contributions to this process.”

The commissioned report, Agroecological and other innovative approaches for sustainable agriculture and food systems that enhance food security and nutrition, two years in the making, is clear on the urgent need for change. “Food systems are at a crossroads. Profound transformation is needed,” the summary begins. It goes on to stress the importance of ecological agriculture, which supports “diversified and resilient production systems, including mixed livestock, fish, cropping and agroforestry, that preserve and enhance biodiversity, as well as the natural resource base.”
Continue reading at: Opinion | Agroecology as Innovation

Groups Launch Legal Action to Protect Waterways from Slaughterhouse Pollution - Waterkeeper Alliance

Conservation groups today filed a formal notice of intent to sue the U.S. Environmental Protection Agency for failing to update slaughterhouse wastewater guidelines as required by the Clean Water Act.



More than 8 billion chickens, 100 million hogs, and 30 million beef cattle are processed each year in more than 5,000 slaughterhouses across the country. An estimated 4,700 of these are currently allowed to discharge processed wastewater directly into waterways or to publicly-owned treatment plants.



“Many of these dirty slaughterhouses contribute to impairments in the waterways where they discharge their pollution,” said Sylvia Lam, Attorney with the Environmental Integrity Project. “The most polluting plants also release far more pollution than the cleanest plants. EPA needs to step in, set stronger national water pollution standards for meat and poultry processing plants, and level the playing field.”



The Clean Water Act requires the EPA to annually review, and potentially strengthen, industry-wide water pollution standards—called effluent limitation guidelines —for slaughterhouses to ensure the guidelines keep pace with advances in technology that reduce the amount of pollution animal processing and rendering facilities discharge into the nation’s waterways.

Continue reading at: Groups Launch Legal Action to Protect Waterways from Slaughterhouse Pollution - Waterkeeper Alliance

Remaining carbon budget - Mercator Research Institute on Global Commons and Climate Change (MCC)

That’s how fast the carbon clock is ticking
The MCC Carbon Clock shows how much CO2 can be released into the atmosphere to limit global warming to a maximum of 1.5°C and 2°C, respectively. With just a few clicks, you can compare the estimates for both temperature targets and see how much time is left in each scenario.

In line with the recent IPCC Special Report on Global Warming of 1.5°C, the Mercator Research Institute on Global Commons and Climate Change (MCC) has updated its Carbon Clock.
In 2015, with the Paris Climate Agreement, all nations around the world set themselves the goal of limiting global warming to well below 2°C (preferably 1.5°C) compared to pre-industrial levels. An ambitious goal.

The Special Report of October 2018 presents new figures: The atmosphere can absorb no more than 420 gigatonnes (Gt) of CO2 if we are to stay below the 1.5°C threshold. However, since around 42 Gt of CO2 is emitted globally every year—the equivalent of 1332 tonnes per second—this budget is expected to be used up in just over nine years. The budget for staying below the 2°C threshold, for its part, of approximately 1170 Gt, will be exhausted in about 26 years.
Continue reading and signup for their newslatter at: Remaining carbon budget - Mercator Research Institute on Global Commons and Climate Change (MCC)

Mi Lead Safe - Mi Lead Safe

Signup for Michigan Safe Drinking Water Virtual Town Halls:



July 9, 6:00 to 7:00 PM ET – Lower Michigan Residents

July 10, 6:00 to 7:00 PM ET – Northern Lower Michigan Residents

July 11, 6:00 to 7:00 PM ET – Upper Peninsula Residents



Do you have a question  you would like addressed during the town halls? SUBMIT QUESTION/COMMENT or send email to EGLE-TownHall@michigan.gov.



Mi Lead Safe - Mi Lead Safe