One thing environmentalists do to take care of trees is, in some extreme cases, to cross-breed them to make them resistant to certain diseases. The American chestnut was struck with a blight that nearly wiped the species out, but the tree is making a comeback after being cross-bred with the Chinese chestnut. The Chinese chestnut is naturally resistant to the blight, and the new American chestnut has been bred to have the characteristics of the old American chestnut plus resistance.
In addition to Sfincher’s response, environmentalists also remove invasive species of vegetation from forests. This gives trees an opportunity for more air, water and space. Invasive species in northern California includes star thistle, mustard, and scotch broom.
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