Crusaders participated in the Crusades for a number of reasons beyond just reclaiming the Holy Land for Christianity. Some of those reasons included forgiveness of sins, travel opportunities, the desire of younger nobles to obtain land in the Middle East, establishment of new cultural contacts between the East and West and the establishment of new trade routes and commercial opportunities.
because foul play was involved
Develop cost-efficient methods to use solar energy
Improve fuel efficiency in automobiles
Increase the use of wind power
Reduce the use of coal and oil
Hope this helped!!
