Tea (especially green tea) and and even coffee are actually very good for human health.
One could gain much more land for human food production by banning the use of animals for food.
70% of all cereals produced on earth are used as animal fodder, and not as food for humans.
30 times more land (comparison based on the nutritional value of the end product) is needed for meat production than for the production of plants for human consumption.
That means, using all land currently used for animal based food production, would give 30 times more human vegetarian food, than we gain currently with meat and milk products.
http://en.wikipedia.org/wiki/Vegetarianism#Environment_and_diet
A varied vegetarian diet is more healthy than meat eating.
One should ban the use of nuclear plants for energy production, because accidents like at Chernobyl, Fukushima, Three Mile Island and others make land unusable for food production for thousands and even millions of years. Through the pollution of the seas and oceans with the time they also make eating fish and seafood impossible.
Furthermore, one could (re)gain much land for human food production by banning the use of corn, cereals and other food for energy production.