Ciba Foundation Symposium 175 - Environmental Change and

Discusses these elements of environmental swap which would have direct or oblique results on human wellbeing and fitness. contains discussions on water toxins, agricultural pollutants, genetic ailment and unique tropical ailments in addition to human food and inhabitants progress.

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Are Salmonella mutants the proper test organism for mutagenicity in all cases? Lake: I would like to ask about ‘natural’ background levels of some of the chemicals in the human environment that you have identified as being toxic. EERO has just made an assessment of dioxins and health (Ahlborg et a1 1992). Bacteria exist that can use dioxins as a substrate to produce energy, which suggests that there are naturally occurring dioxin-like chemicals as well as those mankind has added. Could you say something about the natural background levels of some of the chemicals that you have discussed?

Unprecedented efforts have been made to reduce the global emissions of CFCs. Major industries, which are competing within the modern global economy, have recognized the importance of maintaining a ‘green’ perspective. Future operations will be designed to reduce the direct emissions of chemical byproducts to air, water and soil, and to recycle and to reuse critical solvents such as water. ‘Star Wars’ technologies for the rapid, economical and effective elimination of industrial and domestic wastes will be developed and employed on a large scale.

Use of water by different sectors may differ considerably, according to the status of industrialization and agricultural practices (Table 1). Globally, four categories of countries can be defined (World Resources Institute [ WRI] 1986): those with very low availability of water per capita (1000m3 per year or less), those with low availability (1000-5000m3 per year), those with medium availability (5000- 10 000 m3 per year) and those with high availability (10 000m3 per year or more); the percentage of countries falling into each of these categories is, respectively, 14%, 37%, 14% and 35%.

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