Final answer:
A dataset that can be useful to be cautious about the trend towards increased intensity of rainfall over time is the dataset on future precipitation and storm events.
Step-by-step explanation:
When analyzing the trend towards increased intensity of rainfall over time, a dataset that might be useful to be cautious is the dataset on future precipitation and storm events.
This dataset provides information on how patterns of precipitation and storm events are likely to change, including changes in the amount of rain falling in heavy precipitation events and shifts in storm tracks.
By examining this dataset, researchers can identify regions where there are projected increases in rainfall intensity and take precautionary measures to deal with the potential impacts of these changes.