How has the "smokey bear" campaign damaged forest health? view available hint(s)
it has allowed too much clear-cutting.
it has allowed too many fires to burn in forests.
it has allowed too few fires to burn in forests.
it has focused attention on forests rather than grasslands.

It allowed too few fires to burn in forests.

Explanation:

Before the Smokey Bear campaign began, tree observers and fire historians can observe that fires used to occur every 10 years or so and they would leave a small scar on trees, but would not kill the tree itself. When the campaign got underway, its objective was to stamp out all types of fires. As a result, more and more trees came up and grew in forests, which has now resulted in having more ¨fuel¨ for forest fires with more trees available to burn, which has then resulted in bigger and more dangerous wildfires going out of control. This is what researchers are finding as a damage to forest health.