Half a degree does matter. As you will see here, going beyond 1.5°C, even to 2°C of warming, means committing to the virtual disappearance of the world’s coral reefs within the lifetime of most people. It would also increase heatwave duration for most regions by an entire month each year and raise risks of crop yield losses for key breadbasket areas by 10-15% in just the coming decades.
Read the supplementary factsheet.