• Droughts boost emissions as hydropower dries up

    Recent droughts caused increases in emissions of carbon dioxide and harmful air pollutants from power generation in several western states as fossil fuels came online to replace hampered hydroelectric power. A new study quantifies the impact.

  • Using the National Climate Assessment to prepare for climate change

    Every four years, the National Climate Assessment evaluates the state of climate science and the impact of climate change in the U.S., now and into the future. The most recent NCA was released on Black Friday, and many cities, states, businesses, and local communities are ready to take action on climate change—and they’re wondering how to go about it.

  • “Pause” in global warming was never real, new research proves

    Claims of a “pause” in observed global temperature warming are comprehensively disproved in a pair of new studies published this week. An international team of climate researchers reviewed existing data and studies and reanalyzed them. They concluded there has never been a statistically significant “pause” in global warming. This conclusion holds whether considering the “pause” as a change in the rate of warming in observations or as a mismatch in rate between observations and expectations from climate models.

  • Evidence supporting regulation of greenhouse gases stronger than ever: Scientists

    Sixteen prominent climate scientists argue that there is more reason than ever for the Environmental Protection Agency to regulate greenhouse gases, at the same time some politicians are pushing the EPA to reverse its 2009 decision to do so.

  • Midwest at risk: Big-picture look at climate change impact on U.S. agriculture

    A new study shows that Midwest agriculture is increasingly vulnerable to climate change because of the region’s reliance on growing rain-fed crops. The researchers set out to assess the impact extreme weather is having on agricultural productivity in the United States. While previous studies have looked at the vulnerability of individual field crops, which make up one-third of the country’s agricultural output, researchers haven’t addressed the whole scope of agricultural production, including livestock, at the national level.

  • Water resources in Western U.S. threatened by declining snow mass

    Since 1982, some parts of the West have had a 41 percent reduction in the yearly maximum mass of snow. In Western U.S., winter snows and subsequent snow melt contribute substantially to water resources. Snow melt contributes to groundwater and to surface water sources such as the Colorado River.

  • Inexpensive super-absorbent material offers solution for ocean oil spills

    A super-absorbent material developed by Penn State scientists could dramatically reduce the environmental impact of oil spills on oceans and allow recovered oil to be refined normally. The synthetic material, called i-Petrogel, absorbs more than 40 times its weight in crude oil, and effectively stops the oil from spreading after a spill, according to the researchers.

  • Greenhouse gas levels in atmosphere break another record

    Levels of heat-trapping greenhouse gases in the atmosphere have reached another new record high, according to a report issued on Thursday by the United Nations weather agency, which reveals that there is no sign of reversal of this trend, responsible for climate change, sea level rise, ocean acidification and extreme weather.

  • National Climate Assessment: Will U.S. water problems worsen?

    Upmanu Lall is director of the Columbia Water Center, chair of Earth and Environmental Engineering, and the lead author of the chapter on water resources in the latest U.S. National Climate Assessment. The report, issued two weeks ago, paints a troubling picture of the nation’s climate future, including projected droughts and extreme precipitation events that could worsen already existing problems with U.S. water supplies and infrastructure. Lall discusses the climate change-driven water challenges the U.S. faces, and ideas for how the nation can respond.

  • Carbon emissions from advanced economies to rise in 2018 for first time in five years

    The world’s advanced economies will see an uptick in their carbon dioxide emissions this year, bucking a five year-long decline, according to the International Energy Agency (IEA). Based on the latest available energy data, energy-related CO2 emissions in North America, the European Union and other advanced economies in Asia Pacific grew, as higher oil and gas use more than offset declining coal consumption. As a result, the IEA expects CO2 emissions in these economies to increase by around 0.5 percent in 2018.

  • Students at every grade need to learn climate science: Expert

    The National Climate Assessment, released the day after Thanksgiving, offers motivation and opportunity to bring climate topics into the classroom at every grade level. Even the youngest students are ready to learn about climate science, according to Michael Wysession, professor of Earth and Planetary Sciences in Arts & Sciences at Washington University in St. Louis and executive director of the Teaching Center.

  • World simply “not on track” to slow climate change this year: UN weather agency

    The 20 warmest years on record have been in the past 22 years, with the top four in the past four years. “It is worth repeating once again that we are the first generation to fully understand climate change and the last generation to be able to do something about it,” Professor Petteri Taalas, Secretary-General of the World Meteorological Organization (WMO), said.

  • National security in the Fourth National Climate Assessment

    NCA4 vol. 2: “Climate change presents added risks to interconnected systems that are already exposed to a range of stressors such as aging and deteriorating infrastructure, land-use changes, and population growth. Extreme weather and climate-related impacts on one system can result in increased risks or failures in other critical systems, including water resources, food production and distribution, energy and transportation, public health, international trade, and national security. The full extent of climate change risks to interconnected systems, many of which span regional and national boundaries, is often greater than the sum of risks to individual sectors.”

  • U.S. gov.’s climate assessment: U.S. already suffering severe consequences of climate change

    The Fourth National Climate Assessment (NCA4)—a quadrennial report mandated by Congress since 1990—was released Friday. Thirteen federal agencies develop the NCA using the best available science to help the nation “understand, assess, predict and respond to” climate change. The 1,500-page report examines the climate and economic impacts U.S. residents could expect if drastic action is not taken to address climate change. The consequences of global warming for the U.S. economy, infrastructure, food production, water, and public health are already severe, as flooding, droughts, wildfires, rain storms, and hurricanes intensify. Unless warming is arrested, to consequences are only going to get worse.

  • Climate change is driving wildfires, and not just in California

    There are multiple reasons why wildfires are getting more severe and destructive, but climate change tops the list, notwithstanding claims to the contrary by President Donald Trump and Interior Secretary Ryan Zinke. According to the latest U.S. National Climate Assessment, released on 23 November, higher temperatures and earlier snowmelt are extending the fire season in western states. By 2050, according to the report, the area that burns yearly in the West could be two to six times larger than today. For climate scientists like me, there’s no longer any serious doubt that human activity – primarily burning fossil fuels – is causing the atmosphere to warm relentlessly. Climate change is driving a rapid increase in wildfire risk that has become a national problem. At the same time, healthy forests have become essential for the many valuable benefits they provide the nation and its people. Neither more effective forest management, nor curbing climate change alone will solve the growing wildfire problem, but together they can.