We have enough land in most part of the world that if we lost, say, 10,000 - 100,000 acres a decade due to meltdown, we'd still be pretty okay (and I dont think we'd loose that much, given Generation II reactors that are in service, have a failure record which is something like 1 every 100 hour-years of actual operation) - that said the risk of nuclear meltdown is actually really really really low - even risks of moderate leaks are really low. The larger issue is long term storage of the wastes of the plants, which adds a huge cost to the energy generated.

I'd also consider hat with generation II reactors most of the failures were systems failures, not failures of the reactor itself - we know how to engineer around systems failures.