If you had the sense that Paul Ehrlich and Garrett Hardin are very much figures of the 1970s nexus of environmentalism and population control, it seems you are right. According to Google Ngrams mention of these topics has been declining since peaking during the oil crisis, in the afterglow of the influence of the late 1960s counter-culture. The general social survey has a variable, POPGRWTH, which asks:
And please circle one number for each of these statements to show how much you agree or disagree with it. The earth cannot continue to support population growth at its present rate.
The question was asked in the year 2000 and 2010. Demographic breakdowns below for the pooled responses....
Earth can not sustain population growth
Strongly agreeAgreeNeitherDisagreeStrongly disagree
Highest educational attainment
Intelligence, measured by vocab score (WORDSUM 0-4 = stupid, 5-8 = average, 9-10 = smart)
Word of God113523275
Inspired Word of God114125213
Book of Fables234314182
Opinion as to the existence of God
No way to find out243922141
Some higher power215111171
Believe but with doubts134422192
Know God exists113724244