Hamburg, Germany's greenest city-state, has signed a binding agreement to protect its natural spaces. The "green network" makes up nearly 10% of the state's area, and the new contract ensures that at least 30% of the land remains untouched nature reserves or conservation areas. This compromise balances housing development with environmental protection.

Source: https://www.theguardian.com/environment/2024/oct/24/hamburg-green-space-contract-agreement-wildlife-biodiversity