The world had its hottest year since records began. Every month in the past year was over 1.5 degrees Celsius warmer than pre-industrial averages. The industrial period started around 1850. This is when we started to burn lots of fossil fuel. A climate scientist said there is a "large and continuing shift" in climate change. He warned that new records will be broken, "unless we stop putting greenhouse gases into the atmosphere".

Extreme heat hit many countries this year. In the past year, it was 1.64ºC hotter than 200 years ago. Extreme temperatures are everywhere. In Death Valley, it was 53.9ºC earlier this week. Meanwhile, Las Vegas broke its heat record with a temperature of 48.9ºC. Over 1,000 people died in Saudi Arabia because of the heat. Scientists say we will see more heat-related disasters. A climate scientist said Earth was in crisis.