What are the technicalities?

So during the weekend, I was researching more facts that I can use for my paper. My research topic is food waste and the environmental problems humans are creating for ourselves. The amount of sources I have are really helping me out and they are informative, however, one thing that has been quite difficult for me to find is exactly why we are producing so much food when so much goes to waste. Yes, the demand of food was risen with the population continuing to grow yet 25-45% of food goes untouched and left to get wasted. I have resources that enable me to have an idea, but I am just starting to wonder if we are making so much because we rather have more than enough than not enough? Like, what are the technicalities to this question and why is there not a certain answer. I know there can be multiple answers to this, but if anyone has any sources that can help me with this question, I would really appreciate if you commented below and left the link.

Another question this research paper has led me to was the human health risks we are creating with the air pollution. For example, because of the quantity of human waste we are creating, what does all the methane in the air doing to us humans? I have yet to look this up but this is a serious question we must to take into consideration. Any diseases that continue to grow with our environment worsening that are linked to methane in the air?