As cities face more frequent floods, rising temperatures and water stress, many are rethinking how urban infrastructure should work. In China, one answer is being found, not in concrete alone but in nature.

Parks, wetlands, and urban forests are being designed to do more than provide green space. They can absorb floodwater, cool neighborhoods, and support biodiversity, becoming part of the infrastructure that helps cities adapt to a changing climate. The approach also aligns with China's broader push over the past year to build more livable, resilient, and environmentally sustainable cities.

The need for greater resilience has become increasingly clear. Beijing has experienced several episodes of extreme rainfall over the past decade, including its heaviest recorded downpour since 1951 in 2012 and another major flood event in 2023. Climate experts say China's main summer rain belt has shown signs of moving northward, bringing heavier and more persistent rainfall to some regions that were historically drier.

One of China's best-known responses is the "sponge city" initiative. Instead of relying solely on concrete drainage systems, sponge cities integrate wetlands, parks, rain gardens, and permeable pavements that absorb, store and gradually release rainwater, reducing runoff while improving the urban environment.

The effort combines green infrastructure with conventional engineering. According to China's National Development and Reform Commission, the central government allocated a total of 60 billion yuan (about $8.4 billion) during the 14th Five-Year Plan period (2021–2025) to support citywide sponge-city demonstration projects aimed at improving the natural storage, infiltration and purification of rainwater.

Officials have also stressed that flood resilience requires a broader system that links drainage networks to rivers, lakes, and reservoirs, alongside monitoring technology and emergency management.

At the same time, scientists are using satellite imagery to assess whether urban greening is producing lasting results. A study by researchers from the University of Copenhagen, the Chinese Academy of Sciences and other institutions found that about three-quarters of the major Chinese cities examined increased their tree cover between 2010 and 2019, although the gains were concentrated in megacities such as Beijing and Shanghai.

The study estimated that urban trees covered about 6,000 square kilometers across the surveyed cities in 2019. The researchers noted that trees can reduce urban heat, filter air and water pollution, slow rainfall runoff, store carbon, and support biodiversity, while also benefiting physical and mental health.

Nature-based infrastructure is also changing how cities use water. According to China's Ministry of Water Resources, Beijing's National Stadium, known as the Bird's Nest, uses a rainwater-harvesting system that can meet at least half of the stadium's water demand.

The system can treat up to 58,000 tonnes of rainwater each year, with the recycled water used for flushing toilets, irrigating green spaces, and other non-potable purposes.

As Chinese cities continue to grow, nature is increasingly being designed, not simply as an amenity but as infrastructure, helping cities become more resilient, more livable and better prepared for a changing climate.