> climate change is by far the greatest threat to the environment
The effects of climate change will be uneven across humanity, and many of the worst effects might be second-order (e.g. instability caused by mass migration).
There are other types of environmental change, like accumulation of so-called "forever chemicals", which have the potential to have a more direct effect on the entire human population, and potentially over a shorter time period than climate change. It's not clear to me that climate change is the greatest threat we face.
The effects of climate change will be uneven across humanity, and many of the worst effects might be second-order (e.g. instability caused by mass migration).
There are other types of environmental change, like accumulation of so-called "forever chemicals", which have the potential to have a more direct effect on the entire human population, and potentially over a shorter time period than climate change. It's not clear to me that climate change is the greatest threat we face.