A federal appeals court heard arguments as the government tried again to get the children’s climate lawsuit dismissed.

The 21 children and young adults suing the federal government over climate change argue that they and their generation are already suffering the consequences of climate change, from worsening allergies and asthma to the health risks and stress that come with hurricanes, wildfires and sea level rise threatening their homes.

With the case back in court on Tuesday, some of the heaviest hitters in the public health arena—including 15 major health organization and two former U.S. surgeons general—have been publicly backing them up.

Today’s children will feel the health impacts of climate change into adulthood if the federal government doesn’t transition away from fossil fuels and reduce greenhouse gas emissions, public health experts wrote in a letter published May 30 in the New England Journal of Medicine (NEJM), echoing a larger court brief signed onto by major health organizations.