The other type of cacti are jungle cacti, and they do need humidity. These plants are more succulent-looking, and lack real spines, similar to 'Christmas' cactus. If this is the type you have, they like a bit more water, and during spring and summer, water plentifully to keep the potting mixture thoroughly moist.
There are about 3-4 million animaks euthanized each year by shelters. There actually are about 4-6 million animals euthanized in shelters in America each year. The above are just estimates. Shelters don't always keep accurate records, and no thorough surveys have been done. No one knows the real numbers.
farm animals are killed each year. Over 56 billion farmed animals are killed every year by humans. According to the Food and Agriculture Organization of the United Nations (FAOSTAT, 2008), this figure is expected to double by 2050. More than 3,000 animals die every second in slaughterhouses around the world.