The rate Earth is warming hit an all-time high in 2023 with 92% of last year's surprising record-shattering heat caused by humans, top scientists calculated. The group of 57 scientists from around the world used United Nations-approved methods to examine what's behind last year's deadly burst of heat. They said even with a faster warming rate they don't see evidence of significant acceleration in human-caused climate change beyond increased fossil fuel burning.
5 degrees by early 2029 if emission trajectories don't change. The actual hitting of 1.5 degrees could be years later, but it would be inevitable if all that carbon is used, Forster said. It's not the end of the world or humanity if temperatures blow past the 1.5 limit, but it will be quite bad, scientists said. Past U.N. studies show massive changes to Earth's ecosystem are more likely to kick in between 1.