Tree mortality caused by bark beetles has increased in lodgepole, spruce and ponderosa forests. This increase is correlated with shifts in temperature, this causes extensive tree mortality due to the action of the bark beetles, there are more than 600 species of bark beetles and US agencies are trying to understand and mitigate the effect of this insect in the conifer population
The explorers who tried to find a passage to the East by sailing around South America included all except Cortez. Hernan Cortez ( 1485-1547) was a Spanish explorer that conquered the Aztec Empire.
