Definitely could happen again, and will eventually happen again. All civilizations fall eventually. Current food production, transportation, and preservation is almost entirely ran on fossil fuels (fertilizer, pesticides, machinery, refrigeration, etc). Climate change will eventually make a significant proportion of current productive land unproductive. Climate change, topsoil loss, super-bugs, super-weeds, etc are also already causing problems; and many experts think the current way of doing agriculture are unsustainable.

Hmm... if you're saying that food scarcity has been eliminated, I'm not so sure.

There's that article on the front page right now about many millions of snow crabs dying off due to our warming oceans. I know those specific crabs might not be a daily food source for you personally but shit, it's a strong indicator that our oceans are not doing well.

Also water scarcity is a looming problem resulting from climate change. There might be more rainfall in general but if it's in the wrong place, at the wrong time, or in the wrong volume then we can't use it to grow things. For example, if arable land dries out the surface becomes hydrophobic, then if you get a big downpour it can literally wash away a lot of your fertile soil.

Also, fun fact (maybe factoid IDK), cities generally contain enough food for 3 days.