We are already seeing water shortages, and we're already seeing decreased crop yields. If you're going to make a claim like "that doesn't mean there's nothing we can do" you should provide evidence for that.
I can provide evidence. Are we reducing the amount of carbon we output every year? No. Are we reducing the 25% of carbon emissions due to industrial farming? No. Is the total amount of greenhouse gas in ppm going down each year? No.
There is nothing we can do as individuals. It would take governments cooperating on a planetary scale to begin reducing our carbon emissions. Of course, it's far too late for that, so that's really just a waste of time. Reducing our carbon emissions reduces the particulates in the atmosphere which reflect light back into space, so a reduction in our carbon emissions actually increases global temperatures, hastening our demise.
This is all happening in 2021, and to add insult to injury, a mass extinction is in progress. Could it be that all those plants and animals are unable to adapt to the rapidly rising global temperatures? Humans might be able to adapt for a time, but we can't survive without plants and animals to eat.
As is human nature, by the time the damage becomes apparent to everyone, and our countries cooperate worldwide, our extinction will be imminent.