Instructions: In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Input: Neo-Malthusianism is the advocacy of population control programs, to ensure resources for current and future populations. In Britain the term Malthusian can also refer more specifically to arguments made in favour of preventive birth control, hence organizations such as the Malthusian League. Neo-Malthusians differ from Malthus's theories mainly in their enthusiasm for contraception. Malthus, a devout Christian, believed that 'self-control' (abstinence) was preferable to artificial birth control. In some editions of his essay, Malthus did allow that abstinence was unlikely to be effective on a wide scale, thus advocating the use of artificial means of birth control as a solution to population 'pressure'. Modern 'neo-Malthusians' are generally more concerned than Malthus was, with environmental degradation and catastrophic famine than with poverty.
Output:
who are neo-malthusians and what do they believe