“The real problem is not whether machines think, but whether men do.”
what does this mean in the world today?

Its is exmapling how people are starting to rely on Macines for knowlage

Explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

a bird that nests only in a particular tree species.