If you could change one environmental thing in the world, what would it be?

Forget legislation, institutions and budgets for a moment.

One change.

Something that would genuinely make the planet better for the next generation.

What would you choose — and why?

There is no requirement to choose the biggest or most impressive answer. You might think of the river you played beside as a child, a quieter street, a place for wildlife or safer drinking water for a community far away. Tell us why the change matters to you. Then, if you want, bring the idea back to the real world and suggest one small step towards it.

• Who would benefit? • Why is this your choice? • What could be the first step?