To harvest tomatoes, peppers and cucumbers, to clip herbs, to prune and propagate succulents, people work in oppressive heat and humidity. Some wring out shirts soaked with sweat. Some contend with headaches, dizziness and nausea. Some collapse. Some hover on the brink of exhaustion, backs straining, breathing heavily.

Many do so not out in farm fields, but indoors – under the roofs of greenhouses. In structures designed to control the growing environment of plants, some workers described humidity with temperatures sometimes soaring past 100 degrees Fahrenheit (nearly 38 degrees Celsius).

Spain sweated under its first official heatwave of the year with temperatures expected to reach 40 degrees Celcius (104 Fahrenheit) in a large swathe of the country on Thursday, while Italy, Greece and other areas of southern Europe also struggled to stay cool.

After a relatively bearable spring compared to record heat in 2023 and 2022, millions of Spaniards will be sweltering at least through Saturday before feeling any relief. The nation's weather authority said the only areas to be spared will be the northwest and northern Atlantic coasts.

Several tons of fish have died along one of the main rivers in Brazil's Sao Paulo state after an alleged illegal dumping of industrial waste from a sugar and ethanol plant, environmental authorities and prosecutors said.

A preliminary analysis estimates that between 10 and 20 tons of fish died on the Piracicaba River in southeastern Brazil, Sao Paulo's prosecutors said in a statement.

Another wave of severe storms pummeled a wide swath of the United States and Canada, leading to flash floods and water rescues Wednesday in the Ozark Mountains, dropping a tornado that ravaged a community in upstate New York and stranding drivers in high water around Toronto.

The relentless series of storms has caused deaths or damage from the Plains to New England this week. Hundreds of thousands of people have lost power and air conditioning during days of sweltering heat.

A heat wave across southern Europe forced authorities in Greece to close the Acropolis Wednesday for several hours and two firefighters died while putting out a fire in the Basilicata region in southern Italy, Italian authorities said.

Italy added Palermo, Sicily, to the list of 13 cities in the country with a severe heat warning. Elderly people in the city of Verona were urged to stay indoors, while sprinklers were set up to cool passersby.

The recent stranding of more than 100 dolphins on Cape Cod, the largest such event involving dolphins in U.S. history, is partly due to the peninsula's geography, with its gently sloping sand flats, tidal fluctuations and proximity to productive feeding grounds, experts said.

The elements, along with the hook-like shape of the cape itself, make Cape Cod a global hotspot for dolphin mass strandings.

With the Paris Olympics less than two weeks away, a question hangs over the Games: Will the Seine River be clean enough for athletes to swim in?

Triathlon and marathon swimming are scheduled to take place in the Seine, where it has been illegal to swim for more than a century. Despite the city's efforts to clean up the long-polluted river, the water has tested unsafe for humans in recent weeks, and cleaner on other days. The Games run from July 26-Aug. 11.

Storms spawning multiple tornado reports blew through Iowa, Illinois — including Chicago — and Indiana on Monday, downing trees and power poles and cutting power to more than 460,000 customers and businesses. A woman in Indiana died after a tree fell onto a home, authorities said.

The 44-year-old woman died Monday night in Cedar Lake, Indiana, the Lake County Coroner's office said.

Heavy rains in eastern Afghanistan have killed at least 40 people and injured nearly 350 others, Taliban officials said Tuesday. Separately, at least 17 died when a bus overturned on a main highway, official media said.

Sharafat Zaman Amar, a spokesperson for the Public Health Ministry, confirmed that 40 people had died in Monday's storm and that 347 injured people had been brought for treatment to the regional hospital in Nangarhar from Jalalabad, the capital of Nangarhar province, and nearby districts.

After Greece's warmest winter and earliest heatwave on record, authorities are sounding the alarm over the risk of dire water shortages in the heat of the Mediterranean summer.

"Would you like some water? Turn off the tap!" one public service announcement in Athens implores; another daily spot urges the capital's residents to not fill their bath all the way to the top.