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The first Labor Day holiday was celebrated on Tuesday, September 5, 1882, in New York City, in accordance with the plans of the Central Labor Union.The Central Labor Union held its second Labor Day holiday just a year later, on September 5, 1883.Speeches by prominent men and women were introduced later, as more emphasis was placed upon the economic and civic significance of the holiday.Still later, by a resolution of the American Federation of Labor convention of 1909, the Sunday preceding Labor Day was adopted as Labor Sunday and dedicated to the spiritual and educational aspects of the labor movement.From these, a movement developed to secure state legislation.

The idea spread with the growth of labor organizations, and in 1885 Labor Day was celebrated in many industrial centers of the country.

How did we not panic when the evidence was so obvious that we'd crossed some growth/climate/natural-resource/population redlines all at once?

"The only answer can be denial," argues Paul Gilding, the veteran Australian environmentalist-entrepreneur, who described this moment in a new book called .

A central concept is that water demands are not fixed requirements but rather functions where quantities of water use at different times have varying total and marginal economic values.

This paper reviews techniques to characterize the economic value of water use and include such values in mathematical models.

We identify the key steps in model design and diverse problems, formulations, levels of integration, spatial and temporal scales, and solution techniques addressed and used by over 80 hydro-economic modeling efforts dating back 45-years from 23 countries.

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