Based on the evidence, here is my assessment of this claim:

Reasoning:

• Global temperatures are not decreasing; they continue to rise. According to Copernicus data, 2025 was the third hottest year on record, only marginally cooler than 2023 and 0.13°C cooler than 2024 – the warmest year on record¹. NASA data confirms that 2025, 2024, and 2023 were the three warmest years in its 146-year record².
• The past 11 years have been the 11 warmest on record, demonstrating a clear long-term warming trend rather than a decrease¹³.
• The slight cooling from 2024 to 2025 is attributable to natural climate variability (the development of La Niña conditions), not a reversal of global warming⁴³. This temporary cooling does not reverse the long-term upward trend³.
• Scientists have consistently warned about the dangerous impacts of climate change, but the claim that they said global warming would "kill the world" is a mischaracterization of scientific warnings about severe consequences such as extreme weather, sea level rise, and ecosystem collapse⁵⁶.
• The Union of Concerned Scientists and other authoritative sources confirm that global temperatures are increasing, with each decade since the 1950s being warmer than the previous one⁷.

Overall validity: 5%

1. Copernicus: 2025 was the third hottest year on record | Copernicus
2. NASA SVS | Record Temperature Years: 2025, 2024, and 2023
3. WMO confirms 2025 was one of warmest years on record
4. Global Temperature Report for 2025 - Berkeley Earth
5. The world is likely to exceed a key global warming target soon. Now what?
6. Overshoot: The World Is Hitting Point of No Return on Climate - Yale E360
7. Ten Signs of Global Warming | Union of Concerned Scientists