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 …