29 Hekstra. Impact of Global pollutants ...

An analysis is given of the results of the first and second
workshops (1974, 1975) and of developments since 1975 that are
of importance for the future of the MAB-14 project. Several
approaches to listing of priorities are mentioned. An example
is given of national priorities differing widely from interna-
tional classifications. Some of the processes affecting eco-
systems on a global scale have been selected for a more detai-
led discussion, i.e Impact of Nuclear Radiation, Affection of
the Ozone Layer, CO2 and Climate, and Acidification of Land
and Freshwater Ecosystems.


CONTENTS:

1. Original intentions of the MAB-14 project 1
1.1 basic approaches 1
1.2 scope of the project 1
1.3 emphasis 1
1.4 needs 1
1.5 desired input from other organisations 1
1.6 dose-response relationships 2
2. International developments since 1975 relevant
for the future of MAB-14 3
3. Establishment of global, regional and local priorities 3
3.1 effects classification 3
3.2 UNEP-list of environmentally dangerous chemical
substances and processes of global significance
(UNEP-IRPTC 1984) 4
3.3 classification of substances and processes to
complexity and scale of ecological impact 4
3.4 differences between national and global priority
setting 6
4. Biotic and climate impact of nuclear radiation 8
4.1 radiation hazard 8
4.2 biotic impact 9
4.3 climatic effects (nuclear winter) 9
5. Modification of the ozone layer 15
5.1 causes 15
5.2 climate consequences 18
5.3 biotic consequences 19
6. CO2 and climate 21
6.1 The CO2 problem 21
6.2 climate impact 23
6.3 crop impact 25
6.4 impact on fresh water resources 25
7. Acidification of land and fresh water ecosystems 32
7.1 the acidification problem 32
7.2 impact on fresh water ecosystems 34
7.3 impact on terrestrial ecosystems 35
7.4 prospects 37
Literature 38