A tennis court versus a pizza box. That's the land difference between producing one kilogram of beef and one kilogram of tomatoes. Researchers Joseph Poore and Thomas Nemecek measured the land footprint of 38 different foods. Their findings quantify something we've sensed but rarely seen mapped out precisely. Beef needs 326 square meters per kilogram each year. Lamb requires even more at 370 square meters. Cheese comes in at 88 square meters despite being dairy. Coffee and dark chocolate both rank high because tree crops spread across large areas—21 and 69 square meters respectively. Food Product Land Use (m²/year per kg) Land Use (ft²/year per lb) Lamb & Mutton 369.81 821.54 Beef (beef herd) 326.21 724.66 Cheese 87.79 195.02 Dark Chocolate 68.96 153.16 Beef (dairy herd) 43.24 96.05 Coffee 21.62 48.02 Pig Meat 17.36 38.56 Other Pulses 15.57 34.58 Nuts 12.96 28.7...
Wolves used to live everywhere on this continent. Not just in a few wild corners - everywhere. From the desert mountains of the Southwest up through the Great Plains, across the boreal forests of Canada, out to the Pacific islands, down into Mexico. At least 23 different subspecies evolved to match whatever local conditions they found. The historical map on the left shows where a different subspecies lived. You had Arctic wolves in Greenland and the northern islands, stocky and pale. Mexican wolves in Arizona and New Mexico, smaller and adapted to heat. Great Plains wolves that followed bison herds. Vancouver Island wolves on the Pacific coast. Newfoundland wolves. Labrador wolves. Texas wolves. They filled every available niche. The current map on the right is mostly gray. What's left sits way up in Canada and Alaska, with some holdouts around the Great Lakes and scattered reintroduced groups in the Rockies. Three subspecies went extinct completely - the Mogollon Mountain Wolf fr...