Square dance club goal is to promote and advance square dance as a recreational activity. Typically clubs accomplish this goal through the following activities: This is not an exclusive list, and square dance clubs are constantly on the look out for new ways to achieve their goals. Associations, partnerships and other cooperative ventures have become increasingly more important to square dance clubs. Membership in square dance clubs seems to have peaked in the late '70s and early '80s, and has gradually decreased since that time. Providing classes and training opportunities is the main activity for the majority of square dance clubs. This activity
Solar activity and climate irradiation increases with part of twentieth century warming. Three mechanisms are proposed by which solar activity affects climate: Climate models have been unable to reproduce the rapid warming observed in recent decades when they only consider variations in total solar irradiance and volcanic activity. Hegerl "et al." (2007) concluded that greenhouse gas forcing had "very likely" caused most of the observed global warming since the mid-20th century. In making this conclusion, they allowed for the possibility that climate models had been underestimating the effect of solar forcing. Another line of evidence comes from looking at how temperatures at different levels