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- Author or Editor: Sylvan H. Wittwer x
Abstract
One of the characteristics of today’s world is that changes may be occurring more rapidly than our ability to cope with them. An example is the CO2 level in the atmosphere which is rising at the rate of 1.5 to 2 ppm per year. It is 10% above the level of 25 years ago, and has increased by about 15% during the past century. Increasing levels may be largely beneficial from the standpoint of biological productivity, since the current level (340 ppm) of CO2 is a constraint for primary productivity and photosynthesis for most plant species. But, the effects of a rising level of atmospheric CO2 on climate are uncertain. Biological effects on the other hand, are much more certain, predictable, and measurable. No one knows now—all things considered—the optimal level of atmospheric CO2.
Abstract
We are now in the foothills of the 21st century. As we ascend to the summit, mountainous issues and challenges confront us as to new directions in horticultural research and education. As we look to the future (3, 40, 68), the issues and challenges are both domestic and international. I shall direct my comments first, to the immediate past and present situation; 2nd, lost opportunities and areas of neglect; 3rd, where to from here: options, opportunities, and challenges; and finally, my conclusions.