How close is our food supply system to a catastrophic crisis?

[northernsoul]

It seems like every day, I see a new headline about unprecedented crop failures (the latest re: massive failure of Australia's wheat harvest), runaway inflation in consumer food prices, eroding safeguards for food safety, the disappearance of bees, and possibility of rising fuel costs making the global food distribution system unsustainable. I also think about how few of us have access to the means of producing our own food (unlike the Great Depression when many Americans lived on or had access to working farms).
From my amateur perspective, it seems like there just needs to be a few things going wrong ecologically and economically to create a "perfect storm" for our food supply system, possibly resulting in actual famine in the industrialized world. Am I being alarmist, or are my concerns justified?

If there is cause for concern, what can we do?