Global S&T Development Trend Analysis Platform of Resources and Environment
AMERICAN WARMING: The Fastest-Warming Cities and States in the U.S. | ||
admin | ||
2019-04-17 | ||
发布年 | 2019 | |
语种 | 英语 | |
国家 | 美国 | |
领域 | 气候变化 | |
正文(英文) | Research brief by Climate Central In April 1970, Americans celebrated the first Earth Day, an event meant to heighten public awareness of of environmental protection. Since then, humanity has dumped an enormous amount of heat-trapping gas into the atmosphere. Atmospheric CO2 concentrations rose by more than twice as much in the half century after the first Earth Day than they did in the entire century before 1970. There is now more CO2 in the atmosphere than at any point in at least the last two million years. Humanity’s greenhouse gases have made the world hotter. That warming is at the root of many of climate change’s dangers, from droughts and sea level rise to heatwaves and agricultural problems. Warming is increasing the frequency and intensity of extreme weather, damaging public health, stressing food and water supplies, shifting seasons and ecosystems, boosting sea levels, damaging infrastructure and local economies, and threatening ways of life. Americans across the country are experiencing warming — but it’s not happening at the same rate in each place. To understand how America has warmed since 1970, Climate Central looked at temperature trends in 242 cities and 49 states.
Heating UpSince the late nineteenth century, global temperatures have risen by a little more than 1.8°F (1°C) — a seemingly small number that has big consequences. The United States has warmed by a similar amount (1.3°F to 1.9°F since 1895), and most of the warming has occurred in years since the first Earth Day. That warming has not been equally distributed across the globe, or within the United States. First, take cities. America’s fastest-warming cities all lie in the Southwest — a hotspot for temperature increases. Las Vegas, El Paso, Tucson, and Phoenix have warmed more than any other cities in the country. Each has gotten at least 4.3°F hotter since the first Earth Day. These examples may seem extreme, but they are not exceptions. Since 1970, temperatures have risen at nearly 98 percent of the U.S. cities assessed by Climate Central. Ten cities have warmed by at least 4°F. Another 59 cities — including Philadelphia, Atlanta, and Houston — have gotten at least 3°F warmer. Some southern cities, such as Orlando (0.9°F) and Biloxi (0.5°F) have seen smaller temperature increases, but only six of 242 cities examined have gotten cooler, or seen no change. As for states, temperatures have risen at least 1.8oF in all U.S. states measured, with a national average increase of 2.5oF. While Alaska and some Western states have led the way, the Southern United States has seen far less temperature change. The Arctic is heating up about twice as fast as the rest of the world; in Alaska, average temperatures have increased by 4.2°F since 1970. Temperatures in New Mexico, New Jersey, Delaware, Arizona, and Utah have risen by at least 3°F since 1970. Just as there are differences in warming trends across regions, so is there variation across seasons. In most of the United States — including all of the Northeastern, Southeastern, and Midwestern states — winter is the fastest-warming season. In Vermont, for instance, winters have warmed 5°F since 1970. Winter warming can harm economies centered around cold-weather recreation, such as skiing and snowboarding. In the Southeast, warming can make things tougher for fruit producers, whose trees benefit from periodic chilling time. In California, Nevada, Utah, and Arizona, spring is the fastest-warming season, and temperature changes are stretching out those states’ allergy seasons.
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URL | 查看原文 | |
来源平台 | Climate Central | |
文献类型 | 新闻 | |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/133338 | |
专题 | 气候变化 | |
推荐引用方式 GB/T 7714 | admin. AMERICAN WARMING: The Fastest-Warming Cities and States in the U.S.. 2019. |
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