I found this interesting article refuting myths of the era from 1975. It's an interesting read that, in my mind, makes the need to be proactive about sustainability issues all the more pressing. Many of the same issues we're facing today were prevalent 30 years ago and prior. One may argue that just by that truth alone (a fact which is illustrated by the author in that that we cannot precisely determine how much coal is left in the Earth), there is not a crisis, as usage of natural resources has increased, but they still seem to be available. However, a greater point is made in that, regardless of what the resource is, they are all finite, and it's necessary to find a away to spread our usage around to renewable sources.
Check the link below for the read...
~ Jason Oliver