Today’s Solutions: December 18, 2025

Concrete jungles are being infiltrated with urban green spaces as 31 major cities, including London, Barcelona, and Milan, have signed a declaration to invest in reintroducing nature to their metropolises.

Mayors of each city agreed to strive for the C40 cities network goal of transforming 30 to 40 percent of built-up city surface into green spaces that are more easily accessed by locals and tourists. These spaces include parks, tree-lined streets, and permeable spaces to absorb water and prevent flooding.

There is still time for cities to submit more ideas to achieve these goals, however, some have already been suggested. Milan, for instance, pledged to plant three million trees in the city by 2030, and in Barcelona, authorities have offered to cover 75 percent of the cost of new green rooftops to create urban allotments to be used for generating renewable energy.

The Covid-19 crisis has opened everyone’s eyes to the importance of making urban spaces greener and healthier.

“The green and just recovery that is needed to create more sustainable and healthier cities sees urban nature as a key element for building back better,” says Giuseppe Sala, Mayor of Milan.

“In Milan, we are committed to…[using] nature-based solutions to increase resilience and protect citizens from the climate crisis, to refresh our neighborhoods with green areas and water, and to regenerate the urban environment in a sustainable manner.”

The cities involved in this effort hope that their investments in urban green spaces will improve the wellbeing of their citizens and help them adapt to extreme weather while supporting biodiversity.

Solutions News Source Print this article
More of Today's Solutions

New method uses sound waves to map soil health, stop famine, and restore farm...

BY THE OPTIMIST DAILY EDITORIAL TEAM Across the world, soil scientists are trading in their shovels for something unexpected: seismic sensors. In a breakthrough ...

Read More

This simple 15-minute mindset exercise can ease anxiety, science shows

BY THE OPTIMIST DAILY EDITORIAL TEAM A growing body of research is revealing how a short, simple activity that is done in just 15 ...

Read More

3 habits of the happiest people

Think of the happiest people you know. Do you find yourself often wondering what they are doing to maintain a general level of joy? ...

Read More

Changemakers of the week: GRuB and SparkNJ

Every day on the Optimist Daily, we report on solutions from around the world. Though we love solutions big and small, the ones that ...

Read More