• Addressing climate migration within borders helps countries plan, mitigate effects

    Migration in response to climate change is a big topic in the media. But the focus is all too often on either international cross-boundary movements or short-term population displacement from major floods or droughts. While these forms of population movement are important, they are by no means the whole story. A new report is the first to focus on longer-term climate impacts on crop and water resources and the ways in which they may influence internal migration.

  • L.A. could achieve independence from imported water

    During the height of the California drought that began in late 2011, Los Angeles imported 89 percent of its water from more than 200 miles away — an energy-intensive process. After a yearlong reprieve, Southern California is again under severe water scarcity conditions: Only 2 1/2 inches of rain have fallen in Los Angeles during the past twelve months. This time around, could Los Angeles shift its dependence from imported water to local water? A new report says the city could, eventually — if it does a better job of capturing local stormwater, increases the use of recycled water, cleans up groundwater and steps up conservation measures.

  • South Africa can avoid a national water crisis

    Even if South Africa uses less water and applies all of government’s existing plans, the country will still face a water crisis in the next twenty years. Solutions are within reach – but turning things around will take significant financial investment and political will. A new study sets out aggressive measures to offset guaranteed water shortages in the future.

  • Warm Arctic means colder, snowier winters in Northeastern U.S.

    Scientists have linked the frequency of extreme winter weather in the United States to Arctic temperatures. “Warm temperatures in the Arctic cause the jet stream to take these wild swings, and when it swings farther south, that causes cold air to reach farther south. These swings tend to hang around for awhile, so the weather we have in the eastern United States, whether it’s cold or warm, tends to stay with us longer,” one scientist explains.

  • Several ways limit global temperature rise to 1.5°C

    There are several ways to limit global temperature rise to 1.5°C by 2100, new research says. The study is the first to look at how socioeconomic conditions such as inequalities, energy demand, and international cooperation might affect the feasibility of achieving these goals, and also considers technological and resource assumptions.

  • Small differences in the rate of global warming make a big difference in coastal areas

    The risk from extreme events is exacerbated by the rising global sea level, which in turn depends on the trajectory of global mean surface temperature. Even if global temperatures are stabilized, sea levels are expected to continue to rise for centuries, due to the long residence time of anthropogenic carbon dioxide, the thermal inertia of the ocean, and the slow response of large ice sheets to forcing. Higher temperatures will make extreme events much more common. In New York City, for example, they estimate that “100-year floods” will become annual events under a 1.5 degree rise and twice-annual events with a 2.0 degree rise.

  • Sinking ground in San Francisco Bay exacerbates flooding from rising sea levels

    New research shows that sections of the San Francisco Bay shoreline are sinking at rates of nearly half an inch (10 millimeters) a year. But knowledge of where the ground in the Bay Area is sinking, and by how much, is not included in the official planning maps that authorities use to assess the local flooding risk from rising sea levels. The researchers used radar imaging to measure elevations to discover important gap in planning for sea level rise in Bay Area.

  • MIT energy conference speakers say transformation can happen fast

    The pace of advances in key clean energy technologies has been growing faster than many experts have predicted, to the point that solar and wind power, combined with systems for storing their output, can often be the least expensive options for new types of power-generating capacity. In fact, a radical transformation of the world’s energy landscape is well-underway, experts say.

  • Sea level rise requires new forms of decision making

    U.S, cities facing sea level rise need to look beyond traditional strategies for managing issues such as critical erosion and coastal squeeze, according to new research. Civil society initiatives must now play a crucial role in adapting society to climate change, and decision makers must seriously consider the tradeoff among three options: sea wall; beach-nourishment; and relocating coastal infrastructure.

  • Extreme weather tests U.K. gas security to the limit

    The National Grid, which manages the U.K.’s energy network, warned that it might not have enough gas to meet demand on March 1, due to plummeting temperatures and issues with supply. It has since withdrawn the warning, saying the market response has boosted supplies. But Britain’s lack of flexible energy supply is a serious issue. This isn’t the first time such a warning has been issued and it probably won’t be the last.

  • Flood risk for Americans is greatly underestimated

    A new study has found that forty-one million Americans are at risk from flooding rivers, which is more than three times the current estimate—based on regulatory flood maps—of thirteen million people. The study is based on a new high-resolution model that maps flood risk across the entire continental United States, whereas the existing regulatory flood maps produced by the Federal Emergency Management Agency (FEMA) cover about 60 percent of the continental United States. Avoiding future losses is particularly important as average flood losses in the United States have increased steadily to nearly $10 billion annually.

  • Sea levels rising more than previously expected

    Studying twenty-five years’ worth of satellite data, scientists paint a grim picture of global warming. Sea levels are going up at a faster rate each year, and even sooner than projected. The calculate that at the current pace, the total sea level rise could be twice as high as previous projections by 2100.

  • Risk of extreme weather events higher if Paris Agreement goals are not met

    The Paris Agreement has aspirational goals of limiting temperature rise that will not be met by current commitments but the individual commitments made by parties of the UN Paris Agreement are not enough to fulfill the agreement’s overall goal of limiting global temperature rise to less than 2 degrees Celsius above pre-industrial levels. The difference between the UN goal and the actual country commitments is a mere 1 C, which may seem negligible, but a new study finds that even that 1-degree difference could increase the likelihood of extreme weather.

  • Running out of water: Cape Town, the U.S., and drought

    The recent news that Cape Town, South Africa—a modern city of nearly 4 million residents (plus over 1.5 million tourists yearly)—was on the brink of running out of water, the taps about to run dry, put water back into the headlines. After years of drought in several American states, could this happen closer to home? “The current crisis in Cape Town will almost inevitably repeat itself elsewhere,” says an expert. “Because of geography, many cities in the United States and the world are highly or entirely reliant on local precipitation. In California, for example, most of the Central Coast, including Monterey and Santa Cruz, currently depend on local rainfall. Given climate change, moreover, droughts in the arid regions of the world are likely to become more frequent and more severe. Warmer temperatures, moreover, will raise evapotranspiration rates—increasing agricultural water needs and the amount of stored water lost to evaporation.”

  • Cape Town water crisis highlights a worldwide problem

    The water supply is running dry in Cape Town, South Africa. The city’s reservoirs are shrinking as a three-year drought wears on. If it doesn’t rain soon, the drought could bring South Africa’s second most populous city to its knees. Cape Town residents are adapting as best they can. They are skipping showers and finding new ways to conserve and reuse their meager allowance of 50 liters (13 gallons) per person per day. That allowance may soon be cut in half, too. As soon as April or May, Cape Town could reach “Day Zero,” when the city will shut off the taps in homes and businesses. Residents will need to line up at collection stations to gather their water rations. Only hospitals, schools, and other essential services would still receive piped water. If things continue on in this way, Cape Town is in danger of becoming the world’s first major city to run entirely out of water. How can this happen in a city of four million residents? And what other cities may be at risk?