
Ponderosa pine forest naturally grows at a low tree density, and is dominated by mature trees. Periodic ground fires clear out the ground litter and kill most of the small trees, which keeps the forest healthy.

However, fire suppression policy over the last seventy years has changed the nature of the forest, which is now dominated by high density immature trees, which burn catastrophically as very hot crown fires.
Compare the density of the trees below, with the old growth forest above.

Some people like building their house in dense forest, which inevitably causes their house to become atmospheric CO2.