Ask AI: How can science know that climate change is dangerous to humanity?

Scientists can know that climate change is dangerous to humanity by looking at data on the impact of increasing global temperatures on the environment, animal and human populations. This data can include research on extreme weather phenomena, such as heat waves, floods, and droughts, as well as research on how ecosystems are being affected, such as coral reef die-off, increased spread of disease, desertification, and sea level rise. By understanding the impacts, scientists can understand the dangers climate change poses to humanity and the ways in which it needs to be actively addressed.