First - the world is not overpopulated. Here’s an eye-opening link for you: https://www.weforum.org/agenda/2016/08/think-the-world-is-overcrowded-these-10-maps-show-why-you-re-wrong/
This concept might have been begun in the sixties for the purpose of making way for abortion, euthanasia and for okaying war. Look into this and you will see that there is plenty of land for way more people than presently exist. Land is not particularly well managed, with farmland being plowed over for housing or for cash crops like hybrid fuels. Another topic.
Second - look at 4D ultrasounds of babies in the womb kicking, stretching, etc. Focus on the Family is doing an event in New York City soon. They say: A baby is not alive because it is born. It is born, because it is alive.
Third - why stop at pre-born? Why not let us kill our sassy teenagers?
Fourth - is money is a concern? One new immigrant family with six children told a worker at a pregnancy help centre they could not afford another baby. The worker responded that it would be fiscally more prudent to kill the 14 year old, who will cost a lot more than a baby in the immediate future. (Both parents saw how silly this was and their church, when told of their plight, pitched in and set them up with furnishings, clothing, and food, in order to help them get started in their new life in the US.)
Fifth - we used to say that if it is okay to kill a baby still in the safety of the womb, how big a step is it for society to accept the elderly being killed when they are sick or frail? Everyone in the medical field knows that the last two or so years of life are the time of the greatest medical resources need.
Oh wait – euthanasia is now legal! At least in Canada.
Lastly - in this scenario, how long will it be before “inconvenient” people are silenced?
Life is life, given by God, not to be taken by man. Children are a blessing. Blessed is the man whose quiver is full of them.
How safe does your co-worker feel?
Praying you find a way to show them that neither overpopulation in a given area or environmental issues (which I don’t understand at all) can hold a candle to life. Perhaps ask how they feel about killing feral cats?
Sorry to be so wordy. Big issue. Looking forward to seeing the movie.