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 agree||Agree||Neither||Disagree||Strongly disagree|
|Highest educational attainment|
|Intelligence, measured by vocab score (WORDSUM 0-4 = stupid, 5-8 = average, 9-10 = smart)|
|Word of God||11||35||23||27||5|
|Inspired Word of God||11||41||25||21||3|
|Book of Fables||23||43||14||18||2|
|Opinion as to the existence of God|
|No way to find out||24||39||22||14||1|
|Some higher power||21||51||11||17||1|
|Believe but with doubts||13||44||22||19||2|
|Know God exists||11||37||24||24||4|