No, deciding not to have children when resources are scarce is not group selection. Parents have limited resources to invest in offspring. Yet offspring need a

No, deciding not to have children when resources are scarce is not group selection. Parents have limited resources to invest in offspring. Yet offspring need a certain minimum amount of resources to be viable. If parents are not in a position to provide that level of resources, it is better for their own genes that they wait until resources are more plentiful, otherwise they risk wasting resources on an unviable child.