Evidence also points to the role of a number of contextual factors that can impact intimate relationships. In a recent study on the impact of Hurricane Katrina on marital and partner relationships, researchers found that while many reported negative changes in their relationships, a number also experienced positive changes. More specifically, the advent of Hurricane Katrina led to a number of environmental stressors (for example, unemployment, prolonged separation) that negatively impacted intimate relationships for many couples, though other couples' relationships grew stronger as a result of new employment opportunities, a greater sense of perspective, and higher levels of communication and support. As a result, environmental factors are also understood to contribute heavily to the strength of intimate relationships.