You know what you need to do to help save the universe: feed the poor, give to charity, love thy neighbour (even if said character is an ugly jerk).

But if you’re looking for extra inspiration, invest in Change the World for a Fiver, a colourful book that lists 50 things you can do (most of which require the brain/heart rather than the wallet) to make the world a brighter place.

Suggestions: give blood. Plant your own Christmas tree (packet of seeds attached to page). Use a mug rather than a plastic cup for your daily beverage. Make a will. Write a friendly note to a neighbour (postcard attached).

The same clever people also published Change the World Nine to Five, for those who work in an office. You’ll be encouraged to praise colleagues, photocopy on both sides, take the stairs and say thank you.

Know what to do? Want to do it?

Start by inspiring everyone else to do the same.

Available online at wearewhatwedo.org.