Statistically speaking, as of the present, you are more likely to encounter households with 2+ kids in US or UK, as compared to India. China had a one-child policy with draconian penalities so I am not going to harp on it.
India's population grew because of access to healthcare & increasing life expectancy education, quality of life etc. It is a big country but had a stunted growth till 50s because the life expectancy was <40 years & the poverty gave a double whammy. What can you expect of comforts or wastage, if you were going to school to have a decent breakfast, which was otherwise unavailable (case in point: recollections of my parents elementary school years)
Countries go through population cycles i.e rapid growth, stagnation or declines. The US is ticking, at the moment, faster than China for example (birth + immigration). India touched 1 billion when I was 8. I am going to be 40 soon. Since then it has added only 300 million, not doubled. Talking of resources, I am not aware of resource utilization efficiency, but the gross usage of power & commodities is way higher in developed countries as compared to India or China (mainly due to multiple automobiles, enhanced consumerism, HVAC being omnipresent). Can you imagine how much energy will be consumed in US when one day it hits 1 billion people? I hope you reserve this same sentiment for US then.
I have lived in 5 countries including US, India and China & worked close to the energy sector to speak from experience. Right now the developing countries need to bring almost everyone out of poverty & malnutrition. These arent people who have homelessness by choice (drugs, gambling etc) but by lack of resources for generations. These problems needs cheap energy, which either has to come from sources like coal or highly subsidized from West (Note: It isn't).
I would approach this problem with some sensitivity & humanity if I were in your shoes.