A heat wave that has claimed at least two lives triggered extreme heat warnings across southern and central Europe on Friday, as temperatures soared above 104°F (40°C). The temperature was so extreme in parts of Italy on Friday that even as the sun began to set on the region, heat remained above 100°F, AccuWeather European forecaster Tyler Roys

Summer in Arizona and throughout the Southwest is monsoon season, which means a daily pattern of afternoon thunderstorms, flash floods, dramatic dust clouds and spectacular displays of lightning over the desert. As the climate changes, Arizona’s monsoon rainfall is becoming more intense even as daily average rainfall in parts of the state has

Subtropical Storm Alex became Hurricane Alex on Thursday morning, the first January hurricane to form in the Atlantic since 1938 and the latest twist to an already remarkable winter in the tropics. As of 7 a.m. Eastern time, Alex was about 490 miles south of the central Azores and had maximum sustained winds of 85 mph. It was moving north

Extreme weather was Mother Nature’s harsh holiday present for the Midwest and Deep South this year, and more wild weather is expected in the East through Tuesday. At least 43 people were killed as tornadoes, torrential rain and flooding ravaged Texas and the Deep South on Saturday and Sunday, part of a massive storm system that curled its way

LaGuardia Airport is about to be rebuilt in New York City, but by the end of the century, fish could be swimming where airplanes once parked at the terminal. That’s because sea levels in the area could rise by as much as 6 feet over the next 75 years, according to new predictions released by the state of New York. New York State environment

The catastrophic wildfires burning in California, which killed at least one person over the weekend and injured several others, are being fueled by high temperatures, strong winds and years of withering drought influenced by climate change. The Valley Fire ignited in drought-stricken Northern California early Saturday afternoon, destroying more

Sap a forest of rain — say, for three or four years — toss in seemingly endless sunshine and high temperatures, and you’ve got just the right recipe for some catastrophic wildfires. Such is the story playing out in the West, where, thanks in part to climate change, drought-fueled infernos are incinerating forests at a record pace from Alaska to

Forests are sometimes called the lungs of the earth — they breathe in carbon dioxide in the atmosphere and store it in tree trunks until the forest dies or burns. A new study, however, shows that forests devastated by drought may lose their ability to store carbon over a much longer period than previously thought, reducing their role as a buffer

A Boston University study published Monday in the Proceedings of the National Academy of Sciences shows that a major push in cities like Denver to build dense housing, better transit systems and more bike lanes in their urban core doesn’t necessarily lead to lower per-capita CO2 emissions.

Scientists have mixed opinions about whether stagnant global energy-related CO2 emissions are a trend following the International Energy Agency's announcement that flat emissions show that a growing economy and increasing CO2 emissions are no longer coupled.