Acid Rain is the problem threatening Europe's forests, lakes, and rivers. Acid rain travels via the wind and the acid pollutants can travel through this said wind to multiple countries. It was a large problem in the 1970's and 80's.
The “color barrier” prevented black baseball players from being hired to play with white players in the Major Leagues. Describe characteristics Branch Rickey saw in Jackie Robinson that led him to believe he would be successful in Major League Baseball.
