Air pollution in US National Parks is effecting the environment in what way(s)? a.
plant damage from ozone exposure
b.
high levels of mercury found in endangered bat species
c.
changes to alpine ecosystems due to nitrogen
d.
all of the above

The graph shows the area of forest cover in various regions of the world through a forest station forest habitats have been established in areas that previously didn't have forest and with geographic region has this approach been most successful