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INTRODUCTION; CONTENTS; A TO Z ENTRIES; APPENDIX 1; SOURCES OF ONLINE DATA ON THE ENVIRONMENT; APPENDIX 2; INTERNATIONAL ENVIRONMENT TREATIES; APPENDIX 3; THE BEAUFORT SCALE OF WIND STRENGTH; APPENDIX 4; THE SAFFIR-SIMPSON HURRICANE SCALE; APPENDIX 5; THE FUJITA SCALE OF TORNADO INTENSITY; APPENDIX 6; TORINO ASTEROID AND COMET IMPACT HAZARD SCALE; APPENDIX 7; RICHTER EARTHQUAKE MAGNITUDE AND MODIFIED MERCALLI EARTHQUAKE INTENSITY SCALES; APPENDIX 8; THE GEOLOGICAL TIMESCALE; APPENDIX 9; CHEMICAL ELEMENTS; APPENDIX 10; SI UNITS AND CONVERSIONS