On Climate & Land Management he says “My first heresy says that all the fuss about global warming is grossly exaggerated…the warming is not global.” [edit] (click above for more…)
While he dosen’t directly refer to overpopulation, he concludes that e.g the U.S.A by 2070 will have had it’s ‘turn’ as ‘top nation’ (i.e becomes over-extended militarily, economically and politically-150 yrs average) and we should prepare for a non-American dominated world, China being the obvious. In that regard I would suggest overpopulation becoming more erratic due to possibly new emigration trends, and as a result even more need for Love & Heretics – not only as Dyson says “How does a people that thinks of itself as number one yield gracefully to become number two?”, but also new territories of achievement possibly receiving people en masse.
My favourite heretic? Bob Dylan – no contest!

@jothi
Thanks for your comment. Do you think it all comes back to economics? If so, that’s part of what Manning was trying to say. In relation to your other point: I asked Professor Manning whether incorporating love into science was basically equivalent to incorporating ethics into science more effectively –(as I couldn’t see how else ‘love’ and science could mix in a formal, repeatable (I guess you could say ‘scientific’) way. But he said that he didn’t think formal ethics was necessarily the answer, rather we need to look at the culture in which science appears and work on that. Then, Manning hopes, ‘good’ science –that is, science informed by love– will become more common. Hope this helps!