China restored the world’s most eroded land—but not without challenges

China’s Loess Plateau, once considered the most eroded place on Earth, underwent a massive restoration effort that transformed barren land into thriving forests and farmland, though concerns remain over water use and long-term sustainability.

Helen Davidson reports for The Guardian.


In short:

  • The Chinese government launched the Grain to Green project in 1999 to combat severe erosion on the Loess Plateau, banning overgrazing, tree-cutting, and hillside farming while providing subsidies for sustainable practices.
  • By 2016, China had converted over 11,500 square miles of cropland into forest or grassland, improving soil stability and biodiversity but also raising concerns about reduced water availability.
  • While the project boosted local employment and reduced dust storms, some farmers resisted the changes, fearing loss of food production, and experts warn that the revegetation may now be affecting regional water balance.

Key quote:

“When the environment improved, all the birds returned. The forest has developed its ecological system naturally.”

— Yan Rufeng, forestry worker

Why this matters:

Massive land restoration efforts can reverse decades of environmental degradation, but they also present complex trade-offs. China’s success in regreening the Loess Plateau showcases the power of large-scale conservation, yet it also highlights the need for careful planning to avoid unintended consequences like water shortages. As climate change accelerates desertification and extreme weather patterns, nations worldwide are looking to similar projects as potential models. But China’s experience makes clear that land restoration must be paired with long-term water management strategies. The challenge going forward will be ensuring that these well-intentioned efforts do not come at the cost of other critical resources.

Learn more: Nations tackle worsening drought and desertification in global summit

Firefighters fight a blaze

Increased autism risk linked to exposure to wildfire smoke during pregnancy

In a first-of-its-kind study published in Environmental Science and Technology, researchers found that mothers who were exposed to wildlife smoke during the third trimester of pregnancy were more likely to have children diagnosed with autism by age 5.


In short:

  • More frequent exposure to wildlife smoke during pregnancy was associated with a higher risk of autism in children.
  • The study analyzed more than 200,000 mother-child pairs in Southern California between 2006 to 2014; nearly 60% of them were exposed to wildfire smoke for more than 5 days during pregnancy.
  • The authors also found that prenatal exposure to particulate matter air pollution from a variety of sources — not just wildfires — is associated with an increased risk of autism in children.


Key quote:

“As climate change increases the frequency and intensity of wildfires in many parts of the world, understanding their relationship with autism is important to being able to develop preventive policy and interventions that will protect pregnant women and their children.”

- Study co-author Mostafijur Rahman, via Tulane University’s accompanying press release


Why this matters:

As climate change continues to impact global weather patterns, wildfires have become increasingly intense and frequent. Their impact on air pollution is significant - in California, wildfires account for over 70% of the fine particulate matter exposure on days with poor air quality. Environmental hazards that affect the health of pregnant people and their children can have long-term and severe outcomes. The authors of this study underscore the need for policies that protect vulnerable populations from air pollution and reduce the inequality in its health impacts.


Related EHN coverage:


More resources:

Luglio, David et al. for Environmental Science & Technology. Jan. 20, 2026
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