I can add one specific example. A particular plant is susceptible to a newly introduced beetle. That beetle eats up the plant and puts it at risk. That insect survives because in certain parts of Canada we have slightly warmer winters. It would have died a century ago because the mid-winter average night temperature was lower. It would have been killed.
Now, is it climate change that has put that plant species at risk, or is it the person who accidentally introduced that bug to North America from Asia? The change of climate leading to vegetation change, change in water regime--rain, snow, and all of that--is an important factor, but it's the consequences of that change that lead to the species being threatened. It's not exactly the change in the water regime; it's the consequences of that.