Greece is facing a weekend that may be "the hottest in the last 50 years" during July, according to an expert, while a record heat wave affecting the southern United States is expected to expand in the coming days. Experts attribute the record temperatures to climate change resulting from burning "fossil fuels," noting that global warming plays a crucial role in the heat. The meteorological service reported that "around 80 million people in the United States will experience temperatures exceeding 41 degrees Celsius over the weekend."