It's coming home to roost over the next 50 years or so. It's not just climate change it's sheer space places to grow food for this enormous horde. Either we limit our population growth or the natural world will do it for us and the natural world is doing it for us right now.
For this reason the expansion of relations with all countries is on the agenda of the Islamic Republic of Iran. I mean balanced relationships based on mutual respect and observation of each other's rights.