Taken from the link you just shared SpinachMonster
For example if you say you have two slices of bread a day, it tells you this bread is contributing 43kg to your annual green house gas emissions, which is equivalent to driving a car 111 miles, or heating an average UK home for 6 days. It also uses the equivalent water to 276 showers (each 8-minute) to produce.
A small daily piece of cheese (30g) is about 8 times this, and beef (eg a hamburger) is 66 times this, or eight return flights London to Malaga.
Do people actually believe this nonsense? Does no one actually look at what they are trying to claim and think, I think someone is over egging the pudding a bit here?
How can the calculator tell if you are eating homemade sourdough or Iceland's white sliced?
How does it know if the beef burgers you are eating are from a cow raised on soya in a Brazilian feedlot with water shipped in by tankers or from a cow that's grazed on grass it's entire life and drunk water out of a natural spring.
How does it know of the eggs you eat are from your backyard chickens fed on veg waste from the garden or from caged hens in Thailand.
How does it know if the cheese is from industrial sized Polish dairy 'mega' farms with the milk shipped to elsewhere in the EU before being processed into plastic cheese slices or handcrafted buffalo mozzarella?
It's nonsense!