Current maps showing the North American regions where different types of garden plants will flourish are based on weather data gathered 60 years ago from a few hundred primitive weather stations.
Claim
These new maps (compiled using computerized data from several thousand modern weather stations and input from home gardeners across NA) will be far more useful than the old maps (gathered 60 years ago from a few hundred primitive weather stations).
Evaluate
The question stem doesn't say we're supporting an argument, just that we're supporting a Claim, so we don't necessarily have to think of this as "Conclusion, supported by Evidence".
We just need four reasons why these new maps would be better.
We can focus on the current differences we know about them
OLD MAPS NEW MAPS
weather data gathered computerized data 60 yrs ago from a few from several thousand a few hundred primitive modern weather stations weather stations + input from gardeners
Goal
Find four ways that support that these new ones are more useful when it comes to showing where different types of garden plants will flourish.