Animal welfare -intensive methods protect animals from parasites, harsh weather and shortages of food.Animal welfare-cruelty to animals is not just a matter of pain or physical discomfort. Boredom and frustration cause great suffering, which shows in bizarre behaviour.
Population growth.
From around the 1800's the population of the world has been growing very rapidly. This is due to the introduction of modern medicine, which has stopped a lot of death by disease. Modern farming also helps to increase population growth as it makes more food to feed people with. In under developed countries the death rate is much lower then birth rate. This means that there are more people being born then dying. This causes major problems in those countries and makes it hard to cope with so many people. Problems occur like basic health care and finding places to live, food and education about contraception.
Another strain on the environment is the increasing standard of living in all countries.
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