Kangaroo meat has never been "widely consumed" in Australia, except by the indigenous people before British settlement.
Kangaroo meat is gaining more prominence, as it is a more healthful meat than stock meats. Supermarkets and butchers readily supply kangaroo meat to consumers.
Australia does not have an official national animal emblem, although each of the states has its own animal emblem.Despite what many people think, neither the kangaroo nor the koala is the animal emblem of Australia.The kangaroo and the emu are on Australia's Coat of Arms, but they are not national animal emblems.The kangaroo and emu are widely accepted as the official animals on Australia's emblem.
No such graphs exist. Kangaroo populations fluctuate widely with the seasons, with droughts and floods. It should be remembered also that there are over 60 species of kangaroos in Australia, and populations of each species vary. Data for the Red Kangaroo and Grey Kangaroo in just one region of New South Wales are available at the related link below, but it is not available in a graph. It is a trend that would be repeated in many places around Australia, but which would vary greatly with the states and the season.
According to Modern Marvels, the chickpea is the most widely consumed.
The most widely consumed bean in the world is the soybean. Soybeans are used in various forms such as tofu, soy milk, and soy sauce, and they are a staple ingredient in many cuisines around the world.
Petroleum.
cheddar cheese
Wheat is a widely consumed type of grain.
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Caffeine is the world's most widely consumed psychoactive substance. It is found in coffee, tea, and various other beverages and foods, and is known for its stimulating effects on the brain and nervous system.
Rice and wheat
Kangaroo populations vary widely from year to year in Australia. For example, due to drought conditions, Red kangaroo numbers in NSW dropped from 500,000 in 2002 to 110,000 in 2005. So yes - the food source does affect the population of red kangaroos, but they do repopulate in good years.
According to Wikipedia Pork is the most widely consumed meat and the USDA treats pork as a red meat.