Those foundations are now under strain. Rising physical inactivity, especially among young people, is colliding with escalating climate and nature risks. By the end of this decade, physical inactivity is projected to cost healthcare systems more than $300 billion, according to the World Health Organization, at a time when governments are already carrying historic debt burdens and facing rising rates of non-communicable diseases and related health risks. Extreme heat, air pollution, and water stress are disrupting competitions and discouraging everyday participation, deepening inequalities in access to safe, inclusive places to play.