Course
Sustainability: what can keep going
Work out whether a thing is being used faster than it comes back, who pays when a cost lands next door, how a footprint is counted, and who checks the claim.
The shape of it
15 lessons
About 71 minutes in total. Your progress is kept on this device — no account, nothing sent anywhere.
Course complete
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The lessons
What sustainable means
4 lessons · about 20 min01A tank with a tap and a drain
Work out whether a thing is being used faster than it comes back, and what happens to the tank when it is.
About 5 min
02Some taps refill, some never do
Tell apart a thing that comes back in your lifetime from one that never will, and spot the ones in between.
About 5 min
03One tank, many drains
Work out why a shared tank empties even when every user is being sensible, and what a rule changes.
About 5 min
04More than one tank
Spot that the planet has several tanks, not one, and read which ones scientists say are already past the line.
About 5 min
Who pays
4 lessons · about 19 min05A cost that lands next door
Spot a cost that lands on someone who was not part of the deal, and say what a bill on it changes.
About 5 min
06A price on the bag
Trace what a small charge did to a big number, and tell a charge from a tax.
About 5 min
07A cap and a market
Work out how a falling cap sets a price nobody wrote down, and what the price does.
About 5 min
08A rule instead of a price
Tell apart a rule from a price, and read what the one rule that worked everywhere actually did.
About 5 min
How a footprint is counted
4 lessons · about 18 min09A footprint is a multiplication
Work out a carbon count from a quantity and a factor, and spot which half of the sum you can change.
About 5 min
10Whose count is it
Sort a bakery's and an airport's emissions into the three scopes, and spot which scope hides the most.
About 5 min
11The year you compare against
Work out how one reading becomes a cut or a rise depending on the year it is compared with.
About 5 min
12Per head, per trip, in total
Tell apart a total from a per-head figure, and work out which country looks worst under each.
About 5 min
Who checks
3 lessons · about 15 min13Net is a subtraction
Work out what net zero subtracts, and spot the offset that was never really there.
About 5 min
14A claim and its checker
Tell a claim that was checked from one that was only said, and name who does the checking.
About 5 min
15One flight, taken apart
Take one flight from Heathrow apart with everything in the course: the tank, the bills, the count and the checker.
About 5 min