In the past Y/A has attempted to keep accurate about what they offer, it is a complete disregard for them to only have Global Warming as a category without it being a sub category of Climate Change.
Global Warming is a subcategory of Climate Change. If one only sees a bit of a fact, they are less likely to consider all the facts, if you show the entire picture, it makes more sense.
Why isn’t Climate Change a category?
I doubt they ever do that. It would be nice but I doubt it happens.