Rome: On Tuesday, as sweltering heat waves spread across the world, Europe prepared for heat records.

Continued wildfires in Greece and the Canary Islands put homes in danger while deteriorating the air quality, and they showed no signs of stopping.

Authorities have issued health warnings about the extreme heat across large areas of the world, from China to California, and have urged people to drink water and seek shade from the sun.

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The World Meteorological Agency of the UN stated that the trend of heat waves "shows no signs of decreasing," serving as a stark reminder of the effects of global warming.

Three regions in Italy and Spain received red alerts for extreme heat because of the unforgiving temperatures. However, as of midday, Sicily and Sardinia, two Italian islands, had not surpassed a continental record of 48.8 degrees Celsius set in Sicily in August 2021.

"There's no doubt that the beach is preferable because you can at least benefit from some sea breeze. At the Focene beach close to the capital, Virginia Cesario, 30, said, "It's too hot to even stay in the city.

In Rome, street vendors replaced selfie sticks with parasols and fans as tourists struggled to find any shade at all, and waiters wore short sleeves in place of their more formal, usual attire.

Several fires were still burning around the Greek capital of Athens and beyond, and one of them was burning in the Dervenohoria forest to the northwest of the city.

It was "a difficult day," according to fire spokesman Yannis Artopios, as another heat wave with highs of 44C was predicted for Thursday.

A forest fire near the seaside resort of Loutraki was still burning as of Tuesday. According to the mayor, 1,200 kids were evacuated from summer camps on Monday.

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Red alerts were issued by Italian health authorities for 20 cities, from Venice in the north to Naples in the south.

Teacher Morgana Cucca reported that a children's summer camp in Lanusei, close to Sardinia's eastern coast, only allowed morning beach visits and forbade sports.

Patients in Cagliari, the capital of Sardinia, were reportedly complaining of symptoms associated with the heat. The majority of the time, Angioni said, "they buy magnesium and potassium supplements and ask us to check their blood pressure, which is frequently low.

Highs of 44C were expected in Catalonia and the Balearic Islands of drought-stricken Spain. Lidia Rodriguez, a 27-year-old from Madrid, said, "You can't be in the street; it's horrible, horrible, horrible, horrible."

400 firefighters battled a wildfire in the Canary Islands that destroyed 3,500 hectares of forest and compelled 4,000 people to leave their homes. The authorities issued a warning to the locals to wear face masks outside due to the poor air quality.

Record-breaking temperatures have caused torrential rain in some parts of Asia.

Before a typhoon made landfall late on Monday, bringing strong winds and rain, nearly 260,000 people were evacuated in southern China and Vietnam. By Tuesday, the typhoon had weakened to a tropical storm.

In 32 of the country's 47 prefectures, primarily in the central and southwest, heatstroke warnings were issued.

The world's two largest polluters are reviving stalled diplomatic efforts to reduce emissions that contribute to global warming as the record-breaking heat occurred as US climate envoy John Kerry met with Chinese officials in Beijing.

Kerry called for "global leadership" on climate issues during his speech on Tuesday at Beijing's Great Hall of the People alongside Wang Yi, China's top diplomat.

More than 80 million people in the typically hot and dry western and southern US states were under advisories for a "widespread and oppressive" heat wave that sent Death Valley, California, temperatures to a near-record 52C on Sunday.

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Phoenix, the state capital of Arizona, tied its record of 18 consecutive days with a high of 43°C, and on Tuesday, temperatures were predicted to reach 47°C.

Several wildfires have started in Southern California in recent days, with the largest one, the Rabbit Fire, raging between Los Angeles and Palm Springs.