"do worry about what my food contains, I do worry about the environment, but population growth means we need to either stop people having babies, or work out how to feed them, probably a combination of both..."
We can feed the world, it is what and how we are farming and the price paid for crops that is causing world hunger.
As well as how we are being changed in our eating and shopping habits.
Even the quite jokey programme on last night "100 diet and exercise myths" covered the lack of minerals in our veg thanks to how farming, the food industry, transportation and what we want to eat, has turned some of our veg into junk food, nutritionally speaking.
GM crops damage biodiversity which in turn causes more land to not be able to be used as arable land and is why the insect population is growing and then is able to cause more disease. Couple that with what we (big food corporations from the US and UK) are insisting is grown on the little arable land that is available and people are no longer able to subsistence farm at the level they need to.
World hunger hasn't just happened, it has been created.
The population of less developed countries is falling the average family size is getting smaller, through choice.