The last glacier has melted.
To me, it has already happened.
In reality it hasn’t happened yet. But unless we change the input, we will get that output.
Input = Output
So what we are doing now will lead to an outcome where glaciers, and many other things that not only make the world work and support humans, but are things that we as humans love.
Unless we stop doing things the way we are doing them, we will continue going the way we are going.
The last glaciers will melt much quicker and it will be our fault.