100 Days to COP26: Calls for Radical Climate Action to Stop Catastrophic Temperature Rises We can't let the planet heat up another 1.5 degrees Celsius. By Megan Rowling BARCELONA, July 22 (Thomson Reuters Foundation) - In 2015, years of efforts by small island nations worried about being swallowed up by rising seas as the planet heats paid off: they got world leaders to aim for a global warming limit of 1.5 degrees Celsius in the Paris Agreement on climate change. Their campaign slogan — "1.5 to stay alive" — however, is now being reshaped by others as an increasingly urgent plea to "keep 1.5 alive". Half a decade on, much of the world is under siege from warming-fuelled floods, heatwaves and wildfires, in countries from China to Germany to the United States, with impacts arriving faster than scientists had predicted.