Nearly all individually-tracked debris comes from a handful of events. These are the four clouds in this view, propagated live from public TLEs.

• Fengyun-1C2007 · ASAT test

  China destroyed its own defunct weather satellite with a missile — the largest debris-generating event ever, producing over 3,500 tracked fragments.

  ~1,900 tracked here
• Cosmos-2251 × Iridium-332009 · collision

  The first accidental hypervelocity collision between two intact satellites — a dead Russian Cosmos-2251 and an active Iridium-33 — created two debris clouds.

  ~700 tracked here
• Cosmos-14082021 · ASAT test

  Russia destroyed a defunct satellite in a missile test, creating ~1,500 tracked fragments and forcing the ISS crew to shelter in their capsules.

  few remain tracked here

Data via CelesTrak. Positions are propagated, not real-time.