Three things
Here are 3
Pick one. Each takes about as long as it says.
Ask whether it can be repaired, before you buy it
One question at the point of purchase decides the next ten years of that object.
5 minutesFreeThe planet
Refill the one thing you keep rebuying
Pick a single household item and stop buying new packaging for it. One item, permanently, beats a good fortnight.
Half an hourUnder $10The planet
Find out what your council actually recycles
Ten minutes on their website. Most people are wrong about at least three things, in both directions.
5 minutesFreeThe planet